661907325 has 48 divisors (see below), whose sum is σ = 1164300480. Its totient is φ = 330654720.

The previous prime is 661907273. The next prime is 661907347. The reversal of 661907325 is 523709166.

It is not a de Polignac number, because 661907325 - 2⁹ = 661906813 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 290842 + ... + 293108.

It is an arithmetic number, because the mean of its divisors is an integer number (24256260).

Almost surely, 2^661907325 is an apocalyptic number.

It is an amenable number.

661907325 is a deficient number, since it is larger than the sum of its proper divisors (502393155).

661907325 is a wasteful number, since it uses less digits than its factorization.

661907325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2526 (or 2521 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 661907325 is about 25727.5596394217. The cubic root of 661907325 is about 871.4966641293.

The spelling of 661907325 in words is "six hundred sixty-one million, nine hundred seven thousand, three hundred twenty-five".