645632505522 has 48 divisors (see below), whose sum is σ = 1401045714432. Its totient is φ = 214876347360.

The previous prime is 645632505499. The next prime is 645632505547. The reversal of 645632505522 is 225505236546.

645632505522 is a `hidden beast` number, since 6 + 4 + 5 + 632 + 5 + 0 + 5 + 5 + 2 + 2 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86230063 + ... + 86237549.

It is an arithmetic number, because the mean of its divisors is an integer number (29188452384).

Almost surely, 2^645632505522 is an apocalyptic number.

645632505522 is an abundant number, since it is smaller than the sum of its proper divisors (755413208910).

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

645632505522 is a wasteful number, since it uses less digits than its factorization.

645632505522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14303 (or 14300 counting only the distinct ones).

The product of its (nonzero) digits is 2160000, while the sum is 45.

The spelling of 645632505522 in words is "six hundred forty-five billion, six hundred thirty-two million, five hundred five thousand, five hundred twenty-two".