166665375 has 24 divisors (see below), whose sum is σ = 300444144. Its totient is φ = 88887600.

The previous prime is 166665361. The next prime is 166665379. The reversal of 166665375 is 573566661.

It is not a de Polignac number, because 166665375 - 2⁹ = 166664863 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 166665375.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166665379) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72949 + ... + 75198.

It is an arithmetic number, because the mean of its divisors is an integer number (12518506).

Almost surely, 2^166665375 is an apocalyptic number.

166665375 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166665375 is a deficient number, since it is larger than the sum of its proper divisors (133778769).

166665375 is a wasteful number, since it uses less digits than its factorization.

166665375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148168 (or 148155 counting only the distinct ones).

The product of its digits is 680400, while the sum is 45.

The square root of 166665375 is about 12909.8944612262. The cubic root of 166665375 is about 550.3197864823.

The spelling of 166665375 in words is "one hundred sixty-six million, six hundred sixty-five thousand, three hundred seventy-five".