646064052544 has 28 divisors (see below), whose sum is σ = 1311848089024. Its totient is φ = 315519652224.

The previous prime is 646064052527. The next prime is 646064052547. The reversal of 646064052544 is 445250460646.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 646064052494 and 646064052503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646064052547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117378072 + ... + 117383575.

Almost surely, 2^646064052544 is an apocalyptic number.

646064052544 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

646064052544 is an abundant number, since it is smaller than the sum of its proper divisors (665784036480).

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

646064052544 is a wasteful number, since it uses less digits than its factorization.

646064052544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234761702 (or 234761692 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 46.

The spelling of 646064052544 in words is "six hundred forty-six billion, sixty-four million, fifty-two thousand, five hundred forty-four".