645116625020 has 96 divisors (see below), whose sum is σ = 1673816363520. Its totient is φ = 203878321920.

The previous prime is 645116624951. The next prime is 645116625067. The reversal of 645116625020 is 20526611546.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent 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 31 ways as a sum of consecutive naturals, for example, 3178946 + ... + 3375785.

It is an arithmetic number, because the mean of its divisors is an integer number (17435587120).

Almost surely, 2^645116625020 is an apocalyptic number.

It is an amenable number.

645116625020 is an abundant number, since it is smaller than the sum of its proper divisors (1028699738500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645116625020 is a wasteful number, since it uses less digits than its factorization.

645116625020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6554803 (or 6554801 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 645116625020 in words is "six hundred forty-five billion, one hundred sixteen million, six hundred twenty-five thousand, twenty".