166357752661 has 2 divisors, whose sum is σ = 166357752662. Its totient is φ = 166357752660.

The previous prime is 166357752607. The next prime is 166357752677. The reversal of 166357752661 is 166257753661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161699690161 + 4658062500 = 402119^2 + 68250^2 .

It is a cyclic number.

It is not a de Polignac number, because 166357752661 - 2³⁵ = 131998014293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166357752461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83178876330 + 83178876331.

It is an arithmetic number, because the mean of its divisors is an integer number (83178876331).

Almost surely, 2^166357752661 is an apocalyptic number.

It is an amenable number.

166357752661 is a deficient number, since it is larger than the sum of its proper divisors (1).

166357752661 is an equidigital number, since it uses as much as digits as its factorization.

166357752661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9525600, while the sum is 55.

The spelling of 166357752661 in words is "one hundred sixty-six billion, three hundred fifty-seven million, seven hundred fifty-two thousand, six hundred sixty-one".