166665374 has 4 divisors (see below), whose sum is σ = 249998064. Its totient is φ = 83332686.

The previous prime is 166665361. The next prime is 166665379. The reversal of 166665374 is 473566661.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41666342 + ... + 41666345.

It is an arithmetic number, because the mean of its divisors is an integer number (62499516).

Almost surely, 2^166665374 is an apocalyptic number.

166665374 is a deficient number, since it is larger than the sum of its proper divisors (83332690).

166665374 is an equidigital number, since it uses as much as digits as its factorization.

166665374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83332689.

The product of its digits is 544320, while the sum is 44.

The square root of 166665374 is about 12909.8944224963. The cubic root of 166665374 is about 550.3197853817.

The spelling of 166665374 in words is "one hundred sixty-six million, six hundred sixty-five thousand, three hundred seventy-four".