661168725 has 96 divisors (see below), whose sum is σ = 1299607296. Its totient is φ = 290304000.

The previous prime is 661168699. The next prime is 661168759. The reversal of 661168725 is 527861166.

It is not a de Polignac number, because 661168725 - 2⁶ = 661168661 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 95 ways as a sum of consecutive naturals, for example, 1961757 + ... + 1962093.

It is an arithmetic number, because the mean of its divisors is an integer number (13537576).

Almost surely, 2^661168725 is an apocalyptic number.

It is an amenable number.

661168725 is a deficient number, since it is larger than the sum of its proper divisors (638438571).

661168725 is a wasteful number, since it uses less digits than its factorization.

661168725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495 (or 490 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The square root of 661168725 is about 25713.2013759469. The cubic root of 661168725 is about 871.1723855969.

The spelling of 661168725 in words is "six hundred sixty-one million, one hundred sixty-eight thousand, seven hundred twenty-five".