166665095 has 4 divisors (see below), whose sum is σ = 199998120. Its totient is φ = 133332072.

The previous prime is 166665091. The next prime is 166665097. The reversal of 166665095 is 590566661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 590566661 = 13967 ⋅42283.

It is a cyclic number.

It is not a de Polignac number, because 166665095 - 2² = 166665091 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166665091) 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 in 3 ways as a sum of consecutive naturals, for example, 16666505 + ... + 16666514.

It is an arithmetic number, because the mean of its divisors is an integer number (49999530).

Almost surely, 2^166665095 is an apocalyptic number.

166665095 is a deficient number, since it is larger than the sum of its proper divisors (33333025).

166665095 is an equidigital number, since it uses as much as digits as its factorization.

166665095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33333024.

The product of its (nonzero) digits is 291600, while the sum is 44.

The square root of 166665095 is about 12909.8836168263. The cubic root of 166665095 is about 550.3194783007.

The spelling of 166665095 in words is "one hundred sixty-six million, six hundred sixty-five thousand, ninety-five".