885645661 has 2 divisors, whose sum is σ = 885645662. Its totient is φ = 885645660.

The previous prime is 885645623. The next prime is 885645697. The reversal of 885645661 is 166546588.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 579605625 + 306040036 = 24075^2 + 17494^2 .

It is a cyclic number.

It is not a de Polignac number, because 885645661 - 2⁹ = 885645149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (885645161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 442822830 + 442822831.

It is an arithmetic number, because the mean of its divisors is an integer number (442822831).

Almost surely, 2^885645661 is an apocalyptic number.

It is an amenable number.

885645661 is a deficient number, since it is larger than the sum of its proper divisors (1).

885645661 is an equidigital number, since it uses as much as digits as its factorization.

885645661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1382400, while the sum is 49.

The square root of 885645661 is about 29759.7994112864. The cubic root of 885645661 is about 960.3289024216.

The spelling of 885645661 in words is "eight hundred eighty-five million, six hundred forty-five thousand, six hundred sixty-one".