645593255 has 8 divisors (see below), whose sum is σ = 774991152. Its totient is φ = 516288448.

The previous prime is 645593243. The next prime is 645593261. The reversal of 645593255 is 552395546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645593255 - 2⁸ = 645592999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6974 + ... + 36603.

It is an arithmetic number, because the mean of its divisors is an integer number (96873894).

Almost surely, 2^645593255 is an apocalyptic number.

645593255 is a deficient number, since it is larger than the sum of its proper divisors (129397897).

645593255 is a wasteful number, since it uses less digits than its factorization.

645593255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46545.

The product of its digits is 810000, while the sum is 44.

The square root of 645593255 is about 25408.5272103678. The cubic root of 645593255 is about 864.2770776114.

The spelling of 645593255 in words is "six hundred forty-five million, five hundred ninety-three thousand, two hundred fifty-five".