166163779 has 2 divisors, whose sum is σ = 166163780. Its totient is φ = 166163778.

The previous prime is 166163761. The next prime is 166163783. The reversal of 166163779 is 977361661.

It is a strong prime.

It is an emirp because it is prime and its reverse (977361661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166163779 - 2⁵ = 166163747 is a prime.

It is a super-2 number, since 2×166163779² = 55220802903121682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166163719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83081889 + 83081890.

It is an arithmetic number, because the mean of its divisors is an integer number (83081890).

Almost surely, 2^166163779 is an apocalyptic number.

166163779 is a deficient number, since it is larger than the sum of its proper divisors (1).

166163779 is an equidigital number, since it uses as much as digits as its factorization.

166163779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 285768, while the sum is 46.

The square root of 166163779 is about 12890.4530176406. The cubic root of 166163779 is about 549.7671510213.

The spelling of 166163779 in words is "one hundred sixty-six million, one hundred sixty-three thousand, seven hundred seventy-nine".