64456610520 has 32 divisors (see below), whose sum is σ = 193369831920. Its totient is φ = 17188429440.

The previous prime is 64456610507. The next prime is 64456610551. The reversal of 64456610520 is 2501665446.

64456610520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 268569091 + ... + 268569330.

Almost surely, 2^64456610520 is an apocalyptic number.

64456610520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64456610520 is an abundant number, since it is smaller than the sum of its proper divisors (128913221400).

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

64456610520 is a wasteful number, since it uses less digits than its factorization.

64456610520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537138435 (or 537138431 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 64456610520 in words is "sixty-four billion, four hundred fifty-six million, six hundred ten thousand, five hundred twenty".