166755557 has 2 divisors, whose sum is σ = 166755558. Its totient is φ = 166755556.

The previous prime is 166755527. The next prime is 166755581. The reversal of 166755557 is 755557661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165920161 + 835396 = 12881^2 + 914^2 .

It is a cyclic number.

It is not a de Polignac number, because 166755557 - 2⁶ = 166755493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166755527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83377778 + 83377779.

It is an arithmetic number, because the mean of its divisors is an integer number (83377779).

Almost surely, 2^166755557 is an apocalyptic number.

It is an amenable number.

166755557 is a deficient number, since it is larger than the sum of its proper divisors (1).

166755557 is an equidigital number, since it uses as much as digits as its factorization.

166755557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1102500, while the sum is 47.

The square root of 166755557 is about 12913.3867362516. The cubic root of 166755557 is about 550.4190272321.

The spelling of 166755557 in words is "one hundred sixty-six million, seven hundred fifty-five thousand, five hundred fifty-seven".