645557562522 has 24 divisors (see below), whose sum is σ = 1480984997076. Its totient is φ = 202527862656.

The previous prime is 645557562473. The next prime is 645557562563. The reversal of 645557562522 is 225265755546.

645557562522 is a `hidden beast` number, since 6 + 4 + 5 + 5 + 5 + 7 + 5 + 625 + 2 + 2 = 666.

645557562522 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 640337644521 + 5219918001 = 800211^2 + 72249^2 .

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1054832313 + ... + 1054832924.

Almost surely, 2^645557562522 is an apocalyptic number.

645557562522 is an abundant number, since it is smaller than the sum of its proper divisors (835427434554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645557562522 is a wasteful number, since it uses less digits than its factorization.

645557562522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2109665262 (or 2109665259 counting only the distinct ones).

The product of its digits is 25200000, while the sum is 54.

The spelling of 645557562522 in words is "six hundred forty-five billion, five hundred fifty-seven million, five hundred sixty-two thousand, five hundred twenty-two".