156424723818169 has 9 divisors (see below), whose sum is σ = 157874354878863. Its totient is φ = 154988283854232.

The previous prime is 156424723818109. The next prime is 156424723818197. The reversal of 156424723818169 is 961818327424651.

The square root of 156424723818169 is 12506987.

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

It can be written as a sum of positive squares in only one way, i.e., 109027282041769 + 47397441776400 = 10441613^2 + 6884580^2 .

It is not a de Polignac number, because 156424723818169 - 2¹⁵ = 156424723785401 is a prime.

It is a super-2 number, since 2×156424723818169² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156424723818109) 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, 1363204212 + ... + 1363318954.

Almost surely, 2^{156424723818169} is an apocalyptic number.

156424723818169 is the 12506987-th square number.

156424723818169 is the 6253494-th centered octagonal number.

It is an amenable number.

156424723818169 is a deficient number, since it is larger than the sum of its proper divisors (1449631060694).

156424723818169 is an frugal number, since it uses more digits than its factorization.

156424723818169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229704 (or 114852 counting only the distinct ones).

The product of its digits is 139345920, while the sum is 67.

The spelling of 156424723818169 in words is "one hundred fifty-six trillion, four hundred twenty-four billion, seven hundred twenty-three million, eight hundred eighteen thousand, one hundred sixty-nine".