645105465564 has 48 divisors (see below), whose sum is σ = 1720384044288. Its totient is φ = 184304832768.

The previous prime is 645105465553. The next prime is 645105465569. The reversal of 645105465564 is 465564501546.

It is a super-2 number, since 2×645105465564² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645105465569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1240239 + ... + 1681785.

It is an arithmetic number, because the mean of its divisors is an integer number (35841334256).

Almost surely, 2^645105465564 is an apocalyptic number.

It is an amenable number.

645105465564 is an abundant number, since it is smaller than the sum of its proper divisors (1075278578724).

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

645105465564 is a wasteful number, since it uses less digits than its factorization.

645105465564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458954 (or 458952 counting only the distinct ones).

The product of its (nonzero) digits is 8640000, while the sum is 51.

The spelling of 645105465564 in words is "six hundred forty-five billion, one hundred five million, four hundred sixty-five thousand, five hundred sixty-four".