645674660401636 has 12 divisors (see below), whose sum is σ = 1189400690213680. Its totient is φ = 305845891769160.

The previous prime is 645674660401613. The next prime is 645674660401637. The reversal of 645674660401636 is 636104066476546.

It is not an unprimeable number, because it can be changed into a prime (645674660401637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4247859607830 + ... + 4247859607981.

Almost surely, 2^{645674660401636} is an apocalyptic number.

It is an amenable number.

645674660401636 is a deficient number, since it is larger than the sum of its proper divisors (543726029812044).

645674660401636 is a wasteful number, since it uses less digits than its factorization.

645674660401636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8495719215834 (or 8495719215832 counting only the distinct ones).

The product of its (nonzero) digits is 313528320, while the sum is 64.

The spelling of 645674660401636 in words is "six hundred forty-five trillion, six hundred seventy-four billion, six hundred sixty million, four hundred one thousand, six hundred thirty-six".