645425444163 has 8 divisors (see below), whose sum is σ = 860775493968. Its totient is φ = 430179511904.

The previous prime is 645425444117. The next prime is 645425444197. The reversal of 645425444163 is 361444524546.

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 645425444163 - 2²⁰ = 645424395587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645425444663) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 26014920 + ... + 26039717.

It is an arithmetic number, because the mean of its divisors is an integer number (107596936746).

Almost surely, 2^645425444163 is an apocalyptic number.

645425444163 is a deficient number, since it is larger than the sum of its proper divisors (215350049805).

645425444163 is a wasteful number, since it uses less digits than its factorization.

645425444163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52058773.

The product of its digits is 5529600, while the sum is 48.

The spelling of 645425444163 in words is "six hundred forty-five billion, four hundred twenty-five million, four hundred forty-four thousand, one hundred sixty-three".