875642661 has 12 divisors (see below), whose sum is σ = 1265323488. Its totient is φ = 583528104.

The previous prime is 875642657. The next prime is 875642689. The reversal of 875642661 is 166246578.

875642661 is a `hidden beast` number, since 8 + 7 + 564 + 26 + 61 = 666.

875642661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 875642661 - 2² = 875642657 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (875642611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6016 + ... + 42278.

It is an arithmetic number, because the mean of its divisors is an integer number (105443624).

Almost surely, 2^875642661 is an apocalyptic number.

It is an amenable number.

875642661 is a deficient number, since it is larger than the sum of its proper divisors (389680827).

875642661 is a wasteful number, since it uses less digits than its factorization.

875642661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38952 (or 38949 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 875642661 is about 29591.2598751726. The cubic root of 875642661 is about 956.6996990838.

The spelling of 875642661 in words is "eight hundred seventy-five million, six hundred forty-two thousand, six hundred sixty-one".