166873665 has 48 divisors (see below), whose sum is σ = 314202240. Its totient is φ = 75398400.

The previous prime is 166873661. The next prime is 166873667. The reversal of 166873665 is 566378661.

It is not a de Polignac number, because 166873665 - 2² = 166873661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166873661) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64140 + ... + 66690.

It is an arithmetic number, because the mean of its divisors is an integer number (6545880).

Almost surely, 2^166873665 is an apocalyptic number.

166873665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166873665 is a deficient number, since it is larger than the sum of its proper divisors (147328575).

166873665 is a wasteful number, since it uses less digits than its factorization.

166873665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2662 (or 2655 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 48.

The square root of 166873665 is about 12917.9590106177. The cubic root of 166873665 is about 550.5489450386.

The spelling of 166873665 in words is "one hundred sixty-six million, eight hundred seventy-three thousand, six hundred sixty-five".