665023166 has 8 divisors (see below), whose sum is σ = 999567864. Its totient is φ = 331833880.

The previous prime is 665023109. The next prime is 665023169. The reversal of 665023166 is 661320566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×665023166² = 884511622633327112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665023169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 337625 + ... + 339588.

It is an arithmetic number, because the mean of its divisors is an integer number (124945983).

Almost surely, 2^665023166 is an apocalyptic number.

665023166 is a deficient number, since it is larger than the sum of its proper divisors (334544698).

665023166 is a wasteful number, since it uses less digits than its factorization.

665023166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677706.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 665023166 is about 25788.0430820177. The cubic root of 665023166 is about 872.8620089831.

The spelling of 665023166 in words is "six hundred sixty-five million, twenty-three thousand, one hundred sixty-six".