645053165613525 has 72 divisors (see below), whose sum is σ = 1089629867697280. Its totient is φ = 336667565445120.

The previous prime is 645053165613499. The next prime is 645053165613599. The reversal of 645053165613525 is 525316561350546.

It is not a de Polignac number, because 645053165613525 - 2⁷ = 645053165613397 is a prime.

It is a super-2 number, since 2×645053165613525² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 71393277 + ... + 79919373.

Almost surely, 2^{645053165613525} is an apocalyptic number.

It is an amenable number.

645053165613525 is a deficient number, since it is larger than the sum of its proper divisors (444576702083755).

645053165613525 is a wasteful number, since it uses less digits than its factorization.

645053165613525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8526415 (or 8526297 counting only the distinct ones).

The product of its (nonzero) digits is 48600000, while the sum is 57.

The spelling of 645053165613525 in words is "six hundred forty-five trillion, fifty-three billion, one hundred sixty-five million, six hundred thirteen thousand, five hundred twenty-five".