645164235 has 12 divisors (see below), whose sum is σ = 1118284752. Its totient is φ = 344087568.

The previous prime is 645164231. The next prime is 645164251. The reversal of 645164235 is 532461546.

645164235 is a `hidden beast` number, since 6 + 4 + 5 + 1 + 642 + 3 + 5 = 666.

It is not a de Polignac number, because 645164235 - 2² = 645164231 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645164235.

It is not an unprimeable number, because it can be changed into a prime (645164231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7168447 + ... + 7168536.

It is an arithmetic number, because the mean of its divisors is an integer number (93190396).

Almost surely, 2^645164235 is an apocalyptic number.

645164235 is a deficient number, since it is larger than the sum of its proper divisors (473120517).

645164235 is a wasteful number, since it uses less digits than its factorization.

645164235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14336994 (or 14336991 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 645164235 is about 25400.0833660049. The cubic root of 645164235 is about 864.0855874255.

The spelling of 645164235 in words is "six hundred forty-five million, one hundred sixty-four thousand, two hundred thirty-five".