641646200664 has 96 divisors (see below), whose sum is σ = 2023520447520. Its totient is φ = 179868469248.

The previous prime is 641646200641. The next prime is 641646200683. The reversal of 641646200664 is 466002646146.

641646200664 is a `hidden beast` number, since 6 + 4 + 16 + 4 + 620 + 0 + 6 + 6 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11983737 + ... + 12037160.

It is an arithmetic number, because the mean of its divisors is an integer number (21078337995).

Almost surely, 2^641646200664 is an apocalyptic number.

It is an amenable number.

641646200664 is an abundant number, since it is smaller than the sum of its proper divisors (1381874246856).

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

641646200664 is a wasteful number, since it uses less digits than its factorization.

641646200664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24020969 (or 24020962 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 45.

The spelling of 641646200664 in words is "six hundred forty-one billion, six hundred forty-six million, two hundred thousand, six hundred sixty-four".