166988057 has 2 divisors, whose sum is σ = 166988058. Its totient is φ = 166988056.

The previous prime is 166988051. The next prime is 166988069. The reversal of 166988057 is 750889661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96746896 + 70241161 = 9836^2 + 8381^2 .

It is a cyclic number.

It is not a de Polignac number, because 166988057 - 2⁸ = 166987801 is a prime.

It is a super-2 number, since 2×166988057² = 55770022361270498, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166987996 and 166988014.

It is not a weakly prime, because it can be changed into another prime (166988051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83494028 + 83494029.

It is an arithmetic number, because the mean of its divisors is an integer number (83494029).

Almost surely, 2^166988057 is an apocalyptic number.

It is an amenable number.

166988057 is a deficient number, since it is larger than the sum of its proper divisors (1).

166988057 is an equidigital number, since it uses as much as digits as its factorization.

166988057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 166988057 is about 12922.3858865149. The cubic root of 166988057 is about 550.6747168509.

The spelling of 166988057 in words is "one hundred sixty-six million, nine hundred eighty-eight thousand, fifty-seven".