64567265256 has 72 divisors (see below), whose sum is σ = 189355957830. Its totient is φ = 19866847104.

The previous prime is 64567265239. The next prime is 64567265263. The reversal of 64567265256 is 65256276546.

64567265256 is a `hidden beast` number, since 6 + 4 + 567 + 26 + 5 + 2 + 56 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 12141836100 + 52425429156 = 110190^2 + 228966^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2640991 + ... + 2665326.

Almost surely, 2^64567265256 is an apocalyptic number.

It is an amenable number.

64567265256 is an abundant number, since it is smaller than the sum of its proper divisors (124788692574).

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

64567265256 is a wasteful number, since it uses less digits than its factorization.

64567265256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5306355 (or 5306335 counting only the distinct ones).

The product of its digits is 18144000, while the sum is 54.

The spelling of 64567265256 in words is "sixty-four billion, five hundred sixty-seven million, two hundred sixty-five thousand, two hundred fifty-six".