888642661 has 8 divisors (see below), whose sum is σ = 902505240. Its totient is φ = 874866432.

The previous prime is 888642647. The next prime is 888642709. The reversal of 888642661 is 166246888.

It can be written as a sum of positive squares in 4 ways, for example, as 168740100 + 719902561 = 12990^2 + 26831^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 888642661 - 2¹⁵ = 888609893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (888642611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 690 + ... + 42163.

It is an arithmetic number, because the mean of its divisors is an integer number (112813155).

Almost surely, 2^888642661 is an apocalyptic number.

It is an amenable number.

888642661 is a deficient number, since it is larger than the sum of its proper divisors (13862579).

888642661 is a wasteful number, since it uses less digits than its factorization.

888642661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43175.

The product of its digits is 884736, while the sum is 49.

The square root of 888642661 is about 29810.1100467610. The cubic root of 888642661 is about 961.4109248227.

The spelling of 888642661 in words is "eight hundred eighty-eight million, six hundred forty-two thousand, six hundred sixty-one".