665100166 has 4 divisors (see below), whose sum is σ = 997650252. Its totient is φ = 332550082.

The previous prime is 665100157. The next prime is 665100169. The reversal of 665100166 is 661001566.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665100169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166275040 + ... + 166275043.

It is an arithmetic number, because the mean of its divisors is an integer number (249412563).

Almost surely, 2^665100166 is an apocalyptic number.

665100166 is a deficient number, since it is larger than the sum of its proper divisors (332550086).

665100166 is a wasteful number, since it uses less digits than its factorization.

665100166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332550085.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 665100166 is about 25789.5359787647. The cubic root of 665100166 is about 872.8956959203.

The spelling of 665100166 in words is "six hundred sixty-five million, one hundred thousand, one hundred sixty-six".