166838372 has 6 divisors (see below), whose sum is σ = 291967158. Its totient is φ = 83419184.

The previous prime is 166838341. The next prime is 166838377. The reversal of 166838372 is 273838661.

It can be written as a sum of positive squares in only one way, i.e., 163430656 + 3407716 = 12784^2 + 1846^2 .

It is a super-2 number, since 2×166838372² = 55670084743220768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166838377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20854793 + ... + 20854800.

It is an arithmetic number, because the mean of its divisors is an integer number (48661193).

Almost surely, 2^166838372 is an apocalyptic number.

It is an amenable number.

166838372 is a deficient number, since it is larger than the sum of its proper divisors (125128786).

166838372 is a wasteful number, since it uses less digits than its factorization.

166838372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41709597 (or 41709595 counting only the distinct ones).

The product of its digits is 290304, while the sum is 44.

The square root of 166838372 is about 12916.5928944130. The cubic root of 166838372 is about 550.5101294593.

The spelling of 166838372 in words is "one hundred sixty-six million, eight hundred thirty-eight thousand, three hundred seventy-two".