645163630575 has 24 divisors (see below), whose sum is σ = 1073734598016. Its totient is φ = 341808540000.

The previous prime is 645163630493. The next prime is 645163630649. The reversal of 645163630575 is 575036361546.

It is not a de Polignac number, because 645163630575 - 2⁹ = 645163630063 is a prime.

It is a super-2 number, since 2×645163630575² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28472721 + ... + 28495370.

It is an arithmetic number, because the mean of its divisors is an integer number (44738941584).

Almost surely, 2^645163630575 is an apocalyptic number.

645163630575 is a deficient number, since it is larger than the sum of its proper divisors (428570967441).

645163630575 is a wasteful number, since it uses less digits than its factorization.

645163630575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56968255 (or 56968250 counting only the distinct ones).

The product of its (nonzero) digits is 6804000, while the sum is 51.

The spelling of 645163630575 in words is "six hundred forty-five billion, one hundred sixty-three million, six hundred thirty thousand, five hundred seventy-five".