64508256512 has 72 divisors (see below), whose sum is σ = 150290708736. Its totient is φ = 27058139136.

The previous prime is 64508256493. The next prime is 64508256521. The reversal of 64508256512 is 21565280546.

It is a happy number.

It is a super-2 number, since 2×64508256512² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 298733 + ... + 467180.

Almost surely, 2^64508256512 is an apocalyptic number.

It is an amenable number.

64508256512 is an abundant number, since it is smaller than the sum of its proper divisors (85782452224).

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

64508256512 is an equidigital number, since it uses as much as digits as its factorization.

64508256512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765983 (or 765969 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 44.

The spelling of 64508256512 in words is "sixty-four billion, five hundred eight million, two hundred fifty-six thousand, five hundred twelve".