1660538880 has 1040 divisors, whose sum is σ = 7992319104. Its totient is φ = 318504960.

The previous prime is 1660538849. The next prime is 1660538899. The reversal of 1660538880 is 888350661.

1660538880 is a `hidden beast` number, since 1 + 6 + 605 + 38 + 8 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1040).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 1560 × 792 × 1344.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 127733754 + ... + 127733766.

Almost surely, 2^1660538880 is an apocalyptic number.

1660538880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1660538880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3996159552).

1660538880 is an abundant number, since it is smaller than the sum of its proper divisors (6331780224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1660538880 is a wasteful number, since it uses less digits than its factorization.

1660538880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 1660538880 is about 40749.7101830185. The cubic root of 1660538880 is about 1184.1762581522.

1660538880 divided by its product of nonzero digits (276480) gives a palindrome (6006).

The spelling of 1660538880 in words is "one billion, six hundred sixty million, five hundred thirty-eight thousand, eight hundred eighty".