645206631167 has 32 divisors (see below), whose sum is σ = 783416793600. Its totient is φ = 519715728000.

The previous prime is 645206631163. The next prime is 645206631191. The reversal of 645206631167 is 761136602546.

It is not a de Polignac number, because 645206631167 - 2² = 645206631163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645206631163) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 942992 + ... + 1476362.

It is an arithmetic number, because the mean of its divisors is an integer number (24481774800).

Almost surely, 2^645206631167 is an apocalyptic number.

645206631167 is a deficient number, since it is larger than the sum of its proper divisors (138210162433).

645206631167 is a wasteful number, since it uses less digits than its factorization.

645206631167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533567.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 645206631167 in words is "six hundred forty-five billion, two hundred six million, six hundred thirty-one thousand, one hundred sixty-seven".