158836661 has 4 divisors (see below), whose sum is σ = 168180012. Its totient is φ = 149493312.

The previous prime is 158836621. The next prime is 158836679. The reversal of 158836661 is 166638851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166638851 = 83 ⋅2007697.

It can be written as a sum of positive squares in 2 ways, for example, as 46158436 + 112678225 = 6794^2 + 10615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158836661 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 (158836621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4671650 + ... + 4671683.

It is an arithmetic number, because the mean of its divisors is an integer number (42045003).

Almost surely, 2^158836661 is an apocalyptic number.

It is an amenable number.

158836661 is a deficient number, since it is larger than the sum of its proper divisors (9343351).

158836661 is an equidigital number, since it uses as much as digits as its factorization.

158836661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9343350.

The product of its digits is 207360, while the sum is 44.

The square root of 158836661 is about 12603.0417360255. The cubic root of 158836661 is about 541.5645765574.

The spelling of 158836661 in words is "one hundred fifty-eight million, eight hundred thirty-six thousand, six hundred sixty-one".