266116640 has 96 divisors (see below), whose sum is σ = 670166784. Its totient is φ = 99512320.

The previous prime is 266116639. The next prime is 266116661. The reversal of 266116640 is 46611662.

266116640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 266116597 and 266116606.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 617225 + ... + 617655.

It is an arithmetic number, because the mean of its divisors is an integer number (6980904).

Almost surely, 2^266116640 is an apocalyptic number.

266116640 is a gapful number since it is divisible by the number (20) 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 266116640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (335083392).

266116640 is an abundant number, since it is smaller than the sum of its proper divisors (404050144).

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

266116640 is a wasteful number, since it uses less digits than its factorization.

266116640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690 (or 682 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 266116640 is about 16313.0818670170. The cubic root of 266116640 is about 643.2167477055.

The spelling of 266116640 in words is "two hundred sixty-six million, one hundred sixteen thousand, six hundred forty".