166161577 has 2 divisors, whose sum is σ = 166161578. Its totient is φ = 166161576.

The previous prime is 166161563. The next prime is 166161599. The reversal of 166161577 is 775161661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110271001 + 55890576 = 10501^2 + 7476^2 .

It is an emirp because it is prime and its reverse (775161661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166161577 is a prime.

It is a super-2 number, since 2×166161577² = 55219339342253858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166161277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83080788 + 83080789.

It is an arithmetic number, because the mean of its divisors is an integer number (83080789).

Almost surely, 2^166161577 is an apocalyptic number.

It is an amenable number.

166161577 is a deficient number, since it is larger than the sum of its proper divisors (1).

166161577 is an equidigital number, since it uses as much as digits as its factorization.

166161577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 40.

The square root of 166161577 is about 12890.3676053090. The cubic root of 166161577 is about 549.7647225085.

The spelling of 166161577 in words is "one hundred sixty-six million, one hundred sixty-one thousand, five hundred seventy-seven".