64716627520 has 56 divisors (see below), whose sum is σ = 156632852088. Its totient is φ = 25462272000.

The previous prime is 64716627509. The next prime is 64716627551. The reversal of 64716627520 is 2572661746.

It can be written as a sum of positive squares in 4 ways, for example, as 3545487936 + 61171139584 = 59544^2 + 247328^2 .

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, 1638181 + ... + 1677220.

Almost surely, 2^64716627520 is an apocalyptic number.

It is an amenable number.

64716627520 is an abundant number, since it is smaller than the sum of its proper divisors (91916224568).

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

64716627520 is a wasteful number, since it uses less digits than its factorization.

64716627520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3315479 (or 3315469 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 46.

The spelling of 64716627520 in words is "sixty-four billion, seven hundred sixteen million, six hundred twenty-seven thousand, five hundred twenty".