645644568526 has 16 divisors (see below), whose sum is σ = 999727943040. Its totient is φ = 312402342240.

The previous prime is 645644568497. The next prime is 645644568533. The reversal of 645644568526 is 625865446546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4846480 + ... + 4977916.

It is an arithmetic number, because the mean of its divisors is an integer number (62482996440).

Almost surely, 2^645644568526 is an apocalyptic number.

645644568526 is a deficient number, since it is larger than the sum of its proper divisors (354083374514).

645644568526 is a wasteful number, since it uses less digits than its factorization.

645644568526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210699.

The product of its digits is 165888000, while the sum is 61.

The spelling of 645644568526 in words is "six hundred forty-five billion, six hundred forty-four million, five hundred sixty-eight thousand, five hundred twenty-six".