158791889169 has 27 divisors (see below), whose sum is σ = 242107954569. Its totient is φ = 100275268680.

The previous prime is 158791889159. The next prime is 158791889177. The reversal of 158791889169 is 961988197851.

The square root of 158791889169 is 398487.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 158791889169 - 2⁷ = 158791889041 is a prime.

It is a super-2 number, since 2×158791889169² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 158791889097 and 158791889106.

It is not an unprimeable number, because it can be changed into a prime (158791889149) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 22710264 + ... + 22717254.

Almost surely, 2^158791889169 is an apocalyptic number.

158791889169 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

158791889169 is the 398487-th square number.

158791889169 is the 199244-th centered octagonal number.

It is an amenable number.

158791889169 is a deficient number, since it is larger than the sum of its proper divisors (83316065400).

158791889169 is an frugal number, since it uses more digits than its factorization.

158791889169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14026 (or 7013 counting only the distinct ones).

The product of its digits is 78382080, while the sum is 72.

The spelling of 158791889169 in words is "one hundred fifty-eight billion, seven hundred ninety-one million, eight hundred eighty-nine thousand, one hundred sixty-nine".