166115427 has 4 divisors (see below), whose sum is σ = 221487240. Its totient is φ = 110743616.

The previous prime is 166115399. The next prime is 166115429. The reversal of 166115427 is 724511661.

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 166115427 - 2⁸ = 166115171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166115429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27685902 + ... + 27685907.

It is an arithmetic number, because the mean of its divisors is an integer number (55371810).

Almost surely, 2^166115427 is an apocalyptic number.

166115427 is a deficient number, since it is larger than the sum of its proper divisors (55371813).

166115427 is an equidigital number, since it uses as much as digits as its factorization.

166115427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55371812.

The product of its digits is 10080, while the sum is 33.

The square root of 166115427 is about 12888.5773846457. The cubic root of 166115427 is about 549.7138202648.

The spelling of 166115427 in words is "one hundred sixty-six million, one hundred fifteen thousand, four hundred twenty-seven".