166804170677 has 2 divisors, whose sum is σ = 166804170678. Its totient is φ = 166804170676.

The previous prime is 166804170653. The next prime is 166804170779. The reversal of 166804170677 is 776071408661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152548049476 + 14256121201 = 390574^2 + 119399^2 .

It is a cyclic number.

It is not a de Polignac number, because 166804170677 - 2¹⁶ = 166804105141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166804170077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83402085338 + 83402085339.

It is an arithmetic number, because the mean of its divisors is an integer number (83402085339).

Almost surely, 2^166804170677 is an apocalyptic number.

It is an amenable number.

166804170677 is a deficient number, since it is larger than the sum of its proper divisors (1).

166804170677 is an equidigital number, since it uses as much as digits as its factorization.

166804170677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2370816, while the sum is 53.

The spelling of 166804170677 in words is "one hundred sixty-six billion, eight hundred four million, one hundred seventy thousand, six hundred seventy-seven".