166047977 has 2 divisors, whose sum is σ = 166047978. Its totient is φ = 166047976.

The previous prime is 166047953. The next prime is 166047979. The reversal of 166047977 is 779740661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84254041 + 81793936 = 9179^2 + 9044^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166047977 is a prime.

Together with 166047979, it forms a pair of twin primes.

It is a Chen prime.

It is a pancake number, because a pancake can be divided into 166047977 parts by 18223 straight cuts.

It is not a weakly prime, because it can be changed into another prime (166047979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83023988 + 83023989.

It is an arithmetic number, because the mean of its divisors is an integer number (83023989).

Almost surely, 2^166047977 is an apocalyptic number.

It is an amenable number.

166047977 is a deficient number, since it is larger than the sum of its proper divisors (1).

166047977 is an equidigital number, since it uses as much as digits as its factorization.

166047977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 444528, while the sum is 47.

The square root of 166047977 is about 12885.9604609047. The cubic root of 166047977 is about 549.6394077164.

The spelling of 166047977 in words is "one hundred sixty-six million, forty-seven thousand, nine hundred seventy-seven".