64402837656 has 32 divisors (see below), whose sum is σ = 161032326000. Its totient is φ = 21464248320.

The previous prime is 64402837517. The next prime is 64402837699. The reversal of 64402837656 is 65673820446.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 64402837599 and 64402837608.

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, 51481 + ... + 362568.

Almost surely, 2^64402837656 is an apocalyptic number.

It is an amenable number.

64402837656 is an abundant number, since it is smaller than the sum of its proper divisors (96629488344).

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

64402837656 is a wasteful number, since it uses less digits than its factorization.

64402837656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420539 (or 420535 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 51.

The spelling of 64402837656 in words is "sixty-four billion, four hundred two million, eight hundred thirty-seven thousand, six hundred fifty-six".