645306868684 has 6 divisors (see below), whose sum is σ = 1129287020204. Its totient is φ = 322653434340.

The previous prime is 645306868603. The next prime is 645306868691. The reversal of 645306868684 is 486868603546.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80663358582 + ... + 80663358589.

Almost surely, 2^645306868684 is an apocalyptic number.

It is an amenable number.

645306868684 is a deficient number, since it is larger than the sum of its proper divisors (483980151520).

645306868684 is a wasteful number, since it uses less digits than its factorization.

645306868684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161326717175 (or 161326717173 counting only the distinct ones).

The product of its (nonzero) digits is 159252480, while the sum is 64.

The spelling of 645306868684 in words is "six hundred forty-five billion, three hundred six million, eight hundred sixty-eight thousand, six hundred eighty-four".