166266117613 has 2 divisors, whose sum is σ = 166266117614. Its totient is φ = 166266117612.

The previous prime is 166266117587. The next prime is 166266117617. The reversal of 166266117613 is 316711662661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154466292484 + 11799825129 = 393022^2 + 108627^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166266117613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166266117617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83133058806 + 83133058807.

It is an arithmetic number, because the mean of its divisors is an integer number (83133058807).

Almost surely, 2^166266117613 is an apocalyptic number.

It is an amenable number.

166266117613 is a deficient number, since it is larger than the sum of its proper divisors (1).

166266117613 is an equidigital number, since it uses as much as digits as its factorization.

166266117613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 46.

It can be divided in two parts, 166266117 and 613, that added together give a triangular number (166266730 = T₁₈₂₃₅).

The spelling of 166266117613 in words is "one hundred sixty-six billion, two hundred sixty-six million, one hundred seventeen thousand, six hundred thirteen".