264439432656 has 120 divisors (see below), whose sum is σ = 847195678784. Its totient is φ = 75428236800.

The previous prime is 264439432643. The next prime is 264439432661. The reversal of 264439432656 is 656234934462.

264439432656 is a `hidden beast` number, since 26 + 443 + 94 + 32 + 65 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 387555 + ... + 824061.

Almost surely, 2^264439432656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 264439432656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (423597839392).

264439432656 is an abundant number, since it is smaller than the sum of its proper divisors (582756246128).

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

264439432656 is a wasteful number, since it uses less digits than its factorization.

264439432656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437129 (or 437120 counting only the distinct ones).

The product of its digits is 22394880, while the sum is 54.

The spelling of 264439432656 in words is "two hundred sixty-four billion, four hundred thirty-nine million, four hundred thirty-two thousand, six hundred fifty-six".