646508408260 has 72 divisors (see below), whose sum is σ = 1603786093056. Its totient is φ = 217009802880.

The previous prime is 646508408257. The next prime is 646508408261. The reversal of 646508408260 is 62804805646.

It is not an unprimeable number, because it can be changed into a prime (646508408261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8657124 + ... + 8731483.

It is an arithmetic number, because the mean of its divisors is an integer number (22274806848).

Almost surely, 2^646508408260 is an apocalyptic number.

It is an amenable number.

646508408260 is an abundant number, since it is smaller than the sum of its proper divisors (957277684796).

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

646508408260 is a wasteful number, since it uses less digits than its factorization.

646508408260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17388653 (or 17388638 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 49.

The spelling of 646508408260 in words is "six hundred forty-six billion, five hundred eight million, four hundred eight thousand, two hundred sixty".