645646438124 has 12 divisors (see below), whose sum is σ = 1129887200400. Its totient is φ = 322821523728.

The previous prime is 645646438123. The next prime is 645646438147. The reversal of 645646438124 is 421834646546.

It is not an unprimeable number, because it can be changed into a prime (645646438123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 875942 + ... + 1434770.

It is an arithmetic number, because the mean of its divisors is an integer number (94157266700).

Almost surely, 2^645646438124 is an apocalyptic number.

It is an amenable number.

645646438124 is a deficient number, since it is larger than the sum of its proper divisors (484240762276).

645646438124 is a wasteful number, since it uses less digits than its factorization.

645646438124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847672 (or 847670 counting only the distinct ones).

The product of its digits is 13271040, while the sum is 53.

The spelling of 645646438124 in words is "six hundred forty-five billion, six hundred forty-six million, four hundred thirty-eight thousand, one hundred twenty-four".