645120431224 has 64 divisors (see below), whose sum is σ = 1263768156000. Its totient is φ = 308440903680.

The previous prime is 645120431201. The next prime is 645120431231. The reversal of 645120431224 is 422134021546.

It is a self number, because there is not a number n which added to its sum of digits gives 645120431224.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17522067 + ... + 17558845.

Almost surely, 2^645120431224 is an apocalyptic number.

It is an amenable number.

645120431224 is a deficient number, since it is larger than the sum of its proper divisors (618647724776).

645120431224 is a wasteful number, since it uses less digits than its factorization.

645120431224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37888 (or 37884 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 34.

The spelling of 645120431224 in words is "six hundred forty-five billion, one hundred twenty million, four hundred thirty-one thousand, two hundred twenty-four".