66163320 has 192 divisors, whose sum is σ = 240084000. Its totient is φ = 15704064.

The previous prime is 66163313. The next prime is 66163351. The reversal of 66163320 is 2336166.

66163320 is a `hidden beast` number, since 6 + 6 + 1 + 633 + 20 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 115996 + ... + 116564.

Almost surely, 2^66163320 is an apocalyptic number.

66163320 is a gapful number since it is divisible by the number (60) 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 66163320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120042000).

66163320 is an abundant number, since it is smaller than the sum of its proper divisors (173920680).

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

66163320 is a wasteful number, since it uses less digits than its factorization.

66163320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622 (or 615 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 66163320 is about 8134.0838451543. The cubic root of 66163320 is about 404.4570685545.

Adding to 66163320 its reverse (2336166), we get a palindrome (68499486).

The spelling of 66163320 in words is "sixty-six million, one hundred sixty-three thousand, three hundred twenty".