166561374 has 32 divisors (see below), whose sum is σ = 384215040. Its totient is φ = 47151072.

The previous prime is 166561327. The next prime is 166561411. The reversal of 166561374 is 473165661.

166561374 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13614 + ... + 22769.

It is an arithmetic number, because the mean of its divisors is an integer number (12006720).

Almost surely, 2^166561374 is an apocalyptic number.

166561374 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

166561374 is an abundant number, since it is smaller than the sum of its proper divisors (217653666).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166561374 is a wasteful number, since it uses less digits than its factorization.

166561374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36504.

The product of its digits is 90720, while the sum is 39.

The square root of 166561374 is about 12905.8658756397. The cubic root of 166561374 is about 550.2052941608.

The spelling of 166561374 in words is "one hundred sixty-six million, five hundred sixty-one thousand, three hundred seventy-four".