166776157 has 2 divisors, whose sum is σ = 166776158. Its totient is φ = 166776156.

The previous prime is 166776139. The next prime is 166776173. The reversal of 166776157 is 751677661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166771396 + 4761 = 12914^2 + 69^2 .

It is a cyclic number.

It is not a de Polignac number, because 166776157 - 2²³ = 158387549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166776557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83388078 + 83388079.

It is an arithmetic number, because the mean of its divisors is an integer number (83388079).

Almost surely, 2^166776157 is an apocalyptic number.

It is an amenable number.

166776157 is a deficient number, since it is larger than the sum of its proper divisors (1).

166776157 is an equidigital number, since it uses as much as digits as its factorization.

166776157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 370440, while the sum is 46.

The square root of 166776157 is about 12914.1843335148. The cubic root of 166776157 is about 550.4416914745.

The spelling of 166776157 in words is "one hundred sixty-six million, seven hundred seventy-six thousand, one hundred fifty-seven".