166112691 has 4 divisors (see below), whose sum is σ = 221483592. Its totient is φ = 110741792.

The previous prime is 166112677. The next prime is 166112719. The reversal of 166112691 is 196211661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166112691 - 2¹⁰ = 166111667 is a prime.

It is a super-2 number, since 2×166112691² = 55186852222522962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166111691) 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 in 3 ways as a sum of consecutive naturals, for example, 27685446 + ... + 27685451.

It is an arithmetic number, because the mean of its divisors is an integer number (55370898).

Almost surely, 2^166112691 is an apocalyptic number.

166112691 is a deficient number, since it is larger than the sum of its proper divisors (55370901).

166112691 is an equidigital number, since it uses as much as digits as its factorization.

166112691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55370900.

The product of its digits is 3888, while the sum is 33.

The square root of 166112691 is about 12888.4712437123. The cubic root of 166112691 is about 549.7108022324.

The spelling of 166112691 in words is "one hundred sixty-six million, one hundred twelve thousand, six hundred ninety-one".