646442137082432 has 56 divisors (see below), whose sum is σ = 1326295413367800. Its totient is φ = 312374723788800.

The previous prime is 646442137082389. The next prime is 646442137082447. The reversal of 646442137082432 is 234280731244646.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 171122607355456 + 475319529726976 = 13081384^2 + 21801824^2 .

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, 915723569 + ... + 916429232.

Almost surely, 2^{646442137082432} is an apocalyptic number.

It is an amenable number.

646442137082432 is an abundant number, since it is smaller than the sum of its proper divisors (679853276285368).

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

646442137082432 is a wasteful number, since it uses less digits than its factorization.

646442137082432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1832152999 (or 1832152989 counting only the distinct ones).

The product of its (nonzero) digits is 37158912, while the sum is 56.

The spelling of 646442137082432 in words is "six hundred forty-six trillion, four hundred forty-two billion, one hundred thirty-seven million, eighty-two thousand, four hundred thirty-two".