156123312173 has 2 divisors, whose sum is σ = 156123312174. Its totient is φ = 156123312172.

The previous prime is 156123312161. The next prime is 156123312253. The reversal of 156123312173 is 371213321651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140803556644 + 15319755529 = 375238^2 + 123773^2 .

It is a cyclic number.

It is not a de Polignac number, because 156123312173 - 2²⁰ = 156122263597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156123312473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78061656086 + 78061656087.

It is an arithmetic number, because the mean of its divisors is an integer number (78061656087).

Almost surely, 2^156123312173 is an apocalyptic number.

It is an amenable number.

156123312173 is a deficient number, since it is larger than the sum of its proper divisors (1).

156123312173 is an equidigital number, since it uses as much as digits as its factorization.

156123312173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 35.

The spelling of 156123312173 in words is "one hundred fifty-six billion, one hundred twenty-three million, three hundred twelve thousand, one hundred seventy-three".