64646044656 has 20 divisors (see below), whose sum is σ = 167002282152. Its totient is φ = 21548681536.

The previous prime is 64646044627. The next prime is 64646044669. The reversal of 64646044656 is 65644064646.

It is a super-2 number, since 2×64646044656² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64646044599 and 64646044608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 673396251 + ... + 673396346.

Almost surely, 2^64646044656 is an apocalyptic number.

It is an amenable number.

64646044656 is an abundant number, since it is smaller than the sum of its proper divisors (102356237496).

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

64646044656 is a wasteful number, since it uses less digits than its factorization.

64646044656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346792608 (or 1346792602 counting only the distinct ones).

The product of its (nonzero) digits is 9953280, while the sum is 51.

The spelling of 64646044656 in words is "sixty-four billion, six hundred forty-six million, forty-four thousand, six hundred fifty-six".