158991195169 has 9 divisors (see below), whose sum is σ = 159567855993. Its totient is φ = 158416615152.

The previous prime is 158991195137. The next prime is 158991195191. The reversal of 158991195169 is 961591199851.

It is a happy number.

The square root of 158991195169 is 398737.

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

It can be written as a sum of positive squares in 4 ways, for example, as 19936225 + 158971258944 = 4465^2 + 398712^2 .

It is not a de Polignac number, because 158991195169 - 2⁵ = 158991195137 is a prime.

It is a super-2 number, since 2×158991195169² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 158991195169.

It is not an unprimeable number, because it can be changed into a prime (158991195109) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 148728367 + ... + 148729435.

It is an arithmetic number, because the mean of its divisors is an integer number (17729761777).

Almost surely, 2^158991195169 is an apocalyptic number.

158991195169 is the 398737-th square number.

158991195169 is the 199369-th centered octagonal number.

It is an amenable number.

158991195169 is a deficient number, since it is larger than the sum of its proper divisors (576660824).

158991195169 is an frugal number, since it uses more digits than its factorization.

158991195169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2884 (or 1442 counting only the distinct ones).

The product of its digits is 7873200, while the sum is 64.

Multiplying 158991195169 by its sum of digits (64), we get a square (10175436490816 = 3189896²).

The spelling of 158991195169 in words is "one hundred fifty-eight billion, nine hundred ninety-one million, one hundred ninety-five thousand, one hundred sixty-nine".