645120320032675 has 48 divisors (see below), whose sum is σ = 814410987556192. Its totient is φ = 506814348902400.

The previous prime is 645120320032667. The next prime is 645120320032691. The reversal of 645120320032675 is 576230023021546.

It is not a de Polignac number, because 645120320032675 - 2³ = 645120320032667 is a prime.

It is a super-2 number, since 2×645120320032675² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4267919899 + ... + 4268071051.

Almost surely, 2^{645120320032675} is an apocalyptic number.

645120320032675 is a deficient number, since it is larger than the sum of its proper divisors (169290667523517).

645120320032675 is a wasteful number, since it uses less digits than its factorization.

645120320032675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159128 (or 159123 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 46.

The spelling of 645120320032675 in words is "six hundred forty-five trillion, one hundred twenty billion, three hundred twenty million, thirty-two thousand, six hundred seventy-five".