165215526366557 has 2 divisors, whose sum is σ = 165215526366558. Its totient is φ = 165215526366556.

The previous prime is 165215526366487. The next prime is 165215526366593. The reversal of 165215526366557 is 755663625512561.

165215526366557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97580791133401 + 67634735233156 = 9878299^2 + 8224034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165215526366557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165215526366493 and 165215526366502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165215526360557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82607763183278 + 82607763183279.

It is an arithmetic number, because the mean of its divisors is an integer number (82607763183279).

Almost surely, 2^{165215526366557} is an apocalyptic number.

It is an amenable number.

165215526366557 is a deficient number, since it is larger than the sum of its proper divisors (1).

165215526366557 is an equidigital number, since it uses as much as digits as its factorization.

165215526366557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 340200000, while the sum is 65.

The spelling of 165215526366557 in words is "one hundred sixty-five trillion, two hundred fifteen billion, five hundred twenty-six million, three hundred sixty-six thousand, five hundred fifty-seven".