664745122125 has 192 divisors, whose sum is σ = 1458976296960. Its totient is φ = 284415753600.

The previous prime is 664745122103. The next prime is 664745122157. The reversal of 664745122125 is 521221547466.

664745122125 is a `hidden beast` number, since 6 + 6 + 4 + 7 + 4 + 512 + 2 + 125 = 666.

It is not a de Polignac number, because 664745122125 - 2¹² = 664745118029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 12392112 + ... + 12445638.

It is an arithmetic number, because the mean of its divisors is an integer number (7598834880).

Almost surely, 2^664745122125 is an apocalyptic number.

It is an amenable number.

664745122125 is an abundant number, since it is smaller than the sum of its proper divisors (794231174835).

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

664745122125 is a wasteful number, since it uses less digits than its factorization.

664745122125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53657 (or 53644 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The spelling of 664745122125 in words is "six hundred sixty-four billion, seven hundred forty-five million, one hundred twenty-two thousand, one hundred twenty-five".