156877813973 has 2 divisors, whose sum is σ = 156877813974. Its totient is φ = 156877813972.

The previous prime is 156877813949. The next prime is 156877813979. The reversal of 156877813973 is 379318778651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97470088804 + 59407725169 = 312202^2 + 243737^2 .

It is an emirp because it is prime and its reverse (379318778651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 156877813973 - 2²⁶ = 156810705109 is a prime.

It is a super-2 number, since 2×156877813973² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156877813979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78438906986 + 78438906987.

It is an arithmetic number, because the mean of its divisors is an integer number (78438906987).

Almost surely, 2^156877813973 is an apocalyptic number.

It is an amenable number.

156877813973 is a deficient number, since it is larger than the sum of its proper divisors (1).

156877813973 is an equidigital number, since it uses as much as digits as its factorization.

156877813973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53343360, while the sum is 65.

The spelling of 156877813973 in words is "one hundred fifty-six billion, eight hundred seventy-seven million, eight hundred thirteen thousand, nine hundred seventy-three".