99158661 has 40 divisors (see below), whose sum is σ = 170406720. Its totient is φ = 56287872.

The previous prime is 99158651. The next prime is 99158699. The reversal of 99158661 is 16685199.

99158661 is a `hidden beast` number, since 9 + 9 + 1 + 586 + 61 = 666.

It is not a de Polignac number, because 99158661 - 2⁷ = 99158533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99158641) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 101005 + ... + 101981.

It is an arithmetic number, because the mean of its divisors is an integer number (4260168).

Almost surely, 2^99158661 is an apocalyptic number.

It is an amenable number.

99158661 is a deficient number, since it is larger than the sum of its proper divisors (71248059).

99158661 is a wasteful number, since it uses less digits than its factorization.

99158661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175 (or 1166 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 99158661 is about 9957.8441944027. The cubic root of 99158661 is about 462.8534990160.

The spelling of 99158661 in words is "ninety-nine million, one hundred fifty-eight thousand, six hundred sixty-one".