166766138 has 32 divisors (see below), whose sum is σ = 312474240. Its totient is φ = 64848960.

The previous prime is 166766137. The next prime is 166766177. The reversal of 166766138 is 831667661.

166766138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (166766137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155468 + ... + 156536.

It is an arithmetic number, because the mean of its divisors is an integer number (9764820).

Almost surely, 2^166766138 is an apocalyptic number.

166766138 is a deficient number, since it is larger than the sum of its proper divisors (145708102).

166766138 is a wasteful number, since it uses less digits than its factorization.

166766138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102.

The product of its digits is 217728, while the sum is 44.

The square root of 166766138 is about 12913.7964208826. The cubic root of 166766138 is about 550.4306687443.

The spelling of 166766138 in words is "one hundred sixty-six million, seven hundred sixty-six thousand, one hundred thirty-eight".