156165372401 has 2 divisors, whose sum is σ = 156165372402. Its totient is φ = 156165372400.

The previous prime is 156165372317. The next prime is 156165372427. The reversal of 156165372401 is 104273561651.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92673971776 + 63491400625 = 304424^2 + 251975^2 .

It is a cyclic number.

It is not a de Polignac number, because 156165372401 - 2²⁶ = 156098263537 is a prime.

It is not a weakly prime, because it can be changed into another prime (156165372431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78082686200 + 78082686201.

It is an arithmetic number, because the mean of its divisors is an integer number (78082686201).

Almost surely, 2^156165372401 is an apocalyptic number.

It is an amenable number.

156165372401 is a deficient number, since it is larger than the sum of its proper divisors (1).

156165372401 is an equidigital number, since it uses as much as digits as its factorization.

156165372401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151200, while the sum is 41.

The spelling of 156165372401 in words is "one hundred fifty-six billion, one hundred sixty-five million, three hundred seventy-two thousand, four hundred one".