64646883408 has 20 divisors (see below), whose sum is σ = 167004448928. Its totient is φ = 21548961120.

The previous prime is 64646883397. The next prime is 64646883409. The reversal of 64646883408 is 80438864646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64646883409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 673404988 + ... + 673405083.

Almost surely, 2^64646883408 is an apocalyptic number.

It is an amenable number.

64646883408 is an abundant number, since it is smaller than the sum of its proper divisors (102357565520).

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

64646883408 is a wasteful number, since it uses less digits than its factorization.

64646883408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346810082 (or 1346810076 counting only the distinct ones).

The product of its (nonzero) digits is 21233664, while the sum is 57.

The spelling of 64646883408 in words is "sixty-four billion, six hundred forty-six million, eight hundred eighty-three thousand, four hundred eight".