156311164181 has 2 divisors, whose sum is σ = 156311164182. Its totient is φ = 156311164180.

The previous prime is 156311164169. The next prime is 156311164249. The reversal of 156311164181 is 181461113651.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156150635281 + 160528900 = 395159^2 + 12670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156311164181 is a prime.

It is a super-2 number, since 2×156311164181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156311164151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78155582090 + 78155582091.

It is an arithmetic number, because the mean of its divisors is an integer number (78155582091).

Almost surely, 2^156311164181 is an apocalyptic number.

It is an amenable number.

156311164181 is a deficient number, since it is larger than the sum of its proper divisors (1).

156311164181 is an equidigital number, since it uses as much as digits as its factorization.

156311164181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 38.

The spelling of 156311164181 in words is "one hundred fifty-six billion, three hundred eleven million, one hundred sixty-four thousand, one hundred eighty-one".