166860691 has 2 divisors, whose sum is σ = 166860692. Its totient is φ = 166860690.

The previous prime is 166860677. The next prime is 166860697. The reversal of 166860691 is 196068661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166860691 - 2⁹ = 166860179 is a prime.

It is not a weakly prime, because it can be changed into another prime (166860697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83430345 + 83430346.

It is an arithmetic number, because the mean of its divisors is an integer number (83430346).

Almost surely, 2^166860691 is an apocalyptic number.

166860691 is a deficient number, since it is larger than the sum of its proper divisors (1).

166860691 is an equidigital number, since it uses as much as digits as its factorization.

166860691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 166860691 is about 12917.4568317452. The cubic root of 166860691 is about 550.5346767454.

The spelling of 166860691 in words is "one hundred sixty-six million, eight hundred sixty thousand, six hundred ninety-one".