166136557 has 2 divisors, whose sum is σ = 166136558. Its totient is φ = 166136556.

The previous prime is 166136527. The next prime is 166136573. The reversal of 166136557 is 755631661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141395881 + 24740676 = 11891^2 + 4974^2 .

It is a cyclic number.

It is not a de Polignac number, because 166136557 - 2¹⁵ = 166103789 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166136527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83068278 + 83068279.

It is an arithmetic number, because the mean of its divisors is an integer number (83068279).

Almost surely, 2^166136557 is an apocalyptic number.

It is an amenable number.

166136557 is a deficient number, since it is larger than the sum of its proper divisors (1).

166136557 is an equidigital number, since it uses as much as digits as its factorization.

166136557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113400, while the sum is 40.

The square root of 166136557 is about 12889.3970766673. The cubic root of 166136557 is about 549.7371272724.

The spelling of 166136557 in words is "one hundred sixty-six million, one hundred thirty-six thousand, five hundred fifty-seven".