645636264216 has 64 divisors (see below), whose sum is σ = 1625956675200. Its totient is φ = 213634176000.

The previous prime is 645636264197. The next prime is 645636264307. The reversal of 645636264216 is 612462636546.

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, 2321416 + ... + 2584616.

It is an arithmetic number, because the mean of its divisors is an integer number (25405573050).

Almost surely, 2^645636264216 is an apocalyptic number.

It is an amenable number.

645636264216 is an abundant number, since it is smaller than the sum of its proper divisors (980320410984).

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

645636264216 is a wasteful number, since it uses less digits than its factorization.

645636264216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263960 (or 263956 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 51.

The spelling of 645636264216 in words is "six hundred forty-five billion, six hundred thirty-six million, two hundred sixty-four thousand, two hundred sixteen".