166147691 has 2 divisors, whose sum is σ = 166147692. Its totient is φ = 166147690.

The previous prime is 166147669. The next prime is 166147697. The reversal of 166147691 is 196741661.

It is a strong prime.

It is an emirp because it is prime and its reverse (196741661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166147691 - 2²² = 161953387 is a prime.

It is not a weakly prime, because it can be changed into another prime (166147697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83073845 + 83073846.

It is an arithmetic number, because the mean of its divisors is an integer number (83073846).

Almost surely, 2^166147691 is an apocalyptic number.

166147691 is a deficient number, since it is larger than the sum of its proper divisors (1).

166147691 is an equidigital number, since it uses as much as digits as its factorization.

166147691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 166147691 is about 12889.8289748158. The cubic root of 166147691 is about 549.7494076049.

The spelling of 166147691 in words is "one hundred sixty-six million, one hundred forty-seven thousand, six hundred ninety-one".