156399360676729 has 9 divisors (see below), whose sum is σ = 156660984168717. Its totient is φ = 156138173430624.

The previous prime is 156399360676679. The next prime is 156399360676739. The reversal of 156399360676729 is 927676063993651.

The square root of 156399360676729 is 12505973.

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 16018285221225 + 140381075455504 = 4002285^2 + 11848252^2 .

It is not a de Polignac number, because 156399360676729 - 2¹⁵ = 156399360643961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156399360676739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7716175207 + ... + 7716195475.

Almost surely, 2^{156399360676729} is an apocalyptic number.

156399360676729 is the 12505973-rd square number.

156399360676729 is the 6252987-th centered octagonal number.

It is an amenable number.

156399360676729 is a deficient number, since it is larger than the sum of its proper divisors (261623491988).

156399360676729 is an frugal number, since it uses more digits than its factorization.

156399360676729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41772 (or 20886 counting only the distinct ones).

The product of its (nonzero) digits is 4166497440, while the sum is 79.

It can be divided in two parts, 156399360 and 676729, that added together give a square (157076089 = 12533²).

The spelling of 156399360676729 in words is "one hundred fifty-six trillion, three hundred ninety-nine billion, three hundred sixty million, six hundred seventy-six thousand, seven hundred twenty-nine".