645465564546 has 64 divisors (see below), whose sum is σ = 1459150540416. Its totient is φ = 188625024000.

The previous prime is 645465564539. The next prime is 645465564571.

645465564546 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×645465564546² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 645465564546.

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 31 ways as a sum of consecutive naturals, for example, 893605 + ... + 1445496.

It is an arithmetic number, because the mean of its divisors is an integer number (22799227194).

Almost surely, 2^645465564546 is an apocalyptic number.

645465564546 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

645465564546 is an abundant number, since it is smaller than the sum of its proper divisors (813684975870).

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

645465564546 is a wasteful number, since it uses less digits than its factorization.

645465564546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2339267.

The product of its digits is 207360000, while the sum is 60.

The spelling of 645465564546 in words is "six hundred forty-five billion, four hundred sixty-five million, five hundred sixty-four thousand, five hundred forty-six".