166978057 has 2 divisors, whose sum is σ = 166978058. Its totient is φ = 166978056.

The previous prime is 166978051. The next prime is 166978109. The reversal of 166978057 is 750879661.

166978057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137264656 + 29713401 = 11716^2 + 5451^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166978057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166978057.

It is not a weakly prime, because it can be changed into another prime (166978051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83489028 + 83489029.

It is an arithmetic number, because the mean of its divisors is an integer number (83489029).

Almost surely, 2^166978057 is an apocalyptic number.

It is an amenable number.

166978057 is a deficient number, since it is larger than the sum of its proper divisors (1).

166978057 is an equidigital number, since it uses as much as digits as its factorization.

166978057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 49.

The square root of 166978057 is about 12921.9989552700. The cubic root of 166978057 is about 550.6637243340.

The spelling of 166978057 in words is "one hundred sixty-six million, nine hundred seventy-eight thousand, fifty-seven".