645612165534 has 32 divisors (see below), whose sum is σ = 1475804664576. Its totient is φ = 184445654400.

The previous prime is 645612165511. The next prime is 645612165589. The reversal of 645612165534 is 435561216546.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94347 + ... + 1140230.

It is an arithmetic number, because the mean of its divisors is an integer number (46118895768).

Almost surely, 2^645612165534 is an apocalyptic number.

645612165534 is an abundant number, since it is smaller than the sum of its proper divisors (830192499042).

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

645612165534 is a wasteful number, since it uses less digits than its factorization.

645612165534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247040.

The product of its digits is 2592000, while the sum is 48.

The spelling of 645612165534 in words is "six hundred forty-five billion, six hundred twelve million, one hundred sixty-five thousand, five hundred thirty-four".