645170274770566 has 16 divisors (see below), whose sum is σ = 988414585283520. Its totient is φ = 315699699571200.

The previous prime is 645170274770533. The next prime is 645170274770587. The reversal of 645170274770566 is 665077472071546.

It is a happy number.

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, 236946201 + ... + 239653588.

It is an arithmetic number, because the mean of its divisors is an integer number (61775911580220).

Almost surely, 2^{645170274770566} is an apocalyptic number.

645170274770566 is a deficient number, since it is larger than the sum of its proper divisors (343244310512954).

645170274770566 is a wasteful number, since it uses less digits than its factorization.

645170274770566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476614239.

The product of its (nonzero) digits is 414892800, while the sum is 67.

The spelling of 645170274770566 in words is "six hundred forty-five trillion, one hundred seventy billion, two hundred seventy-four million, seven hundred seventy thousand, five hundred sixty-six".