525317661 has 24 divisors (see below), whose sum is σ = 854480640. Its totient is φ = 308102400.

The previous prime is 525317657. The next prime is 525317669. The reversal of 525317661 is 166713525.

525317661 is a `hidden beast` number, since 52 + 531 + 76 + 6 + 1 = 666.

It is not a de Polignac number, because 525317661 - 2² = 525317657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525317669) 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 23 ways as a sum of consecutive naturals, for example, 82516 + ... + 88653.

It is an arithmetic number, because the mean of its divisors is an integer number (35603360).

Almost surely, 2^525317661 is an apocalyptic number.

It is an amenable number.

525317661 is a deficient number, since it is larger than the sum of its proper divisors (329162979).

525317661 is a wasteful number, since it uses less digits than its factorization.

525317661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171217 (or 171214 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 525317661 is about 22919.8093578459. The cubic root of 525317661 is about 806.8769960349.

The spelling of 525317661 in words is "five hundred twenty-five million, three hundred seventeen thousand, six hundred sixty-one".