64758408656 has 20 divisors (see below), whose sum is σ = 125477592804. Its totient is φ = 32377094400.

The previous prime is 64758408599. The next prime is 64758408667. The reversal of 64758408656 is 65680485746.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 22903795600 + 41854613056 = 151340^2 + 204584^2 .

It is a junction number, because it is equal to n+sod(n) for n = 64758408595 and 64758408604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138086 + ... + 385466.

Almost surely, 2^64758408656 is an apocalyptic number.

It is an amenable number.

64758408656 is a deficient number, since it is larger than the sum of its proper divisors (60719184148).

64758408656 is a wasteful number, since it uses less digits than its factorization.

64758408656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263750 (or 263744 counting only the distinct ones).

The product of its (nonzero) digits is 38707200, while the sum is 59.

The spelling of 64758408656 in words is "sixty-four billion, seven hundred fifty-eight million, four hundred eight thousand, six hundred fifty-six".