166491701 has 2 divisors, whose sum is σ = 166491702. Its totient is φ = 166491700.

The previous prime is 166491691. The next prime is 166491713. The reversal of 166491701 is 107194661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163072900 + 3418801 = 12770^2 + 1849^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166491701 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 (166491791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83245850 + 83245851.

It is an arithmetic number, because the mean of its divisors is an integer number (83245851).

Almost surely, 2^166491701 is an apocalyptic number.

It is an amenable number.

166491701 is a deficient number, since it is larger than the sum of its proper divisors (1).

166491701 is an equidigital number, since it uses as much as digits as its factorization.

166491701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 166491701 is about 12903.1663168387. The cubic root of 166491701 is about 550.1285660877.

The spelling of 166491701 in words is "one hundred sixty-six million, four hundred ninety-one thousand, seven hundred one".