166972814 has 4 divisors (see below), whose sum is σ = 250459224. Its totient is φ = 83486406.

The previous prime is 166972781. The next prime is 166972829. The reversal of 166972814 is 418279661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 418279661 = 19 ⋅22014719.

It is a congruent number.

It is an unprimeable number.

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, 41743202 + ... + 41743205.

It is an arithmetic number, because the mean of its divisors is an integer number (62614806).

Almost surely, 2^166972814 is an apocalyptic number.

166972814 is a deficient number, since it is larger than the sum of its proper divisors (83486410).

166972814 is an equidigital number, since it uses as much as digits as its factorization.

166972814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83486409.

The product of its digits is 145152, while the sum is 44.

The square root of 166972814 is about 12921.7960825885. The cubic root of 166972814 is about 550.6579607821.

The spelling of 166972814 in words is "one hundred sixty-six million, nine hundred seventy-two thousand, eight hundred fourteen".