645356275 has 12 divisors (see below), whose sum is σ = 811515024. Its totient is φ = 509012000.

The previous prime is 645356267. The next prime is 645356311. The reversal of 645356275 is 572653546.

It is not a de Polignac number, because 645356275 - 2³ = 645356267 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 180016 + ... + 183565.

It is an arithmetic number, because the mean of its divisors is an integer number (67626252).

Almost surely, 2^645356275 is an apocalyptic number.

645356275 is a deficient number, since it is larger than the sum of its proper divisors (166158749).

645356275 is a wasteful number, since it uses less digits than its factorization.

645356275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363662 (or 363657 counting only the distinct ones).

The product of its digits is 756000, while the sum is 43.

The square root of 645356275 is about 25403.8633872882. The cubic root of 645356275 is about 864.1713136770.

The spelling of 645356275 in words is "six hundred forty-five million, three hundred fifty-six thousand, two hundred seventy-five".