645979200432 has 160 divisors (see below), whose sum is σ = 1776284524800. Its totient is φ = 201591742464.

The previous prime is 645979200421. The next prime is 645979200457. The reversal of 645979200432 is 234002979546.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126486423 + ... + 126491529.

It is an arithmetic number, because the mean of its divisors is an integer number (11101778280).

Almost surely, 2^645979200432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645979200432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (888142262400).

645979200432 is an abundant number, since it is smaller than the sum of its proper divisors (1130305324368).

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

645979200432 is a wasteful number, since it uses less digits than its factorization.

645979200432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5923 (or 5917 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 51.

The spelling of 645979200432 in words is "six hundred forty-five billion, nine hundred seventy-nine million, two hundred thousand, four hundred thirty-two".