645054535520 has 48 divisors (see below), whose sum is σ = 1525338582768. Its totient is φ = 257785244160.

The previous prime is 645054535493. The next prime is 645054535603. The reversal of 645054535520 is 25535450546.

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, 1673099 + ... + 2022218.

It is an arithmetic number, because the mean of its divisors is an integer number (31777887141).

Almost surely, 2^645054535520 is an apocalyptic number.

It is an amenable number.

645054535520 is an abundant number, since it is smaller than the sum of its proper divisors (880284047248).

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

645054535520 is a wasteful number, since it uses less digits than its factorization.

645054535520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3696423 (or 3696415 counting only the distinct ones).

The product of its (nonzero) digits is 1800000, while the sum is 44.

The spelling of 645054535520 in words is "six hundred forty-five billion, fifty-four million, five hundred thirty-five thousand, five hundred twenty".