646242404660 has 48 divisors (see below), whose sum is σ = 1430758056000. Its totient is φ = 244510907904.

The previous prime is 646242404653. The next prime is 646242404671. The reversal of 646242404660 is 66404242646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1078085 + ... + 1566764.

It is an arithmetic number, because the mean of its divisors is an integer number (29807459500).

Almost surely, 2^646242404660 is an apocalyptic number.

It is an amenable number.

646242404660 is an abundant number, since it is smaller than the sum of its proper divisors (784515651340).

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

646242404660 is a wasteful number, since it uses less digits than its factorization.

646242404660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2645520 (or 2645518 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 44.

The spelling of 646242404660 in words is "six hundred forty-six billion, two hundred forty-two million, four hundred four thousand, six hundred sixty".