665151166 has 32 divisors (see below), whose sum is σ = 1033920288. Its totient is φ = 320785920.

The previous prime is 665151139. The next prime is 665151169. The reversal of 665151166 is 661151566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665151169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2366946 + ... + 2367226.

It is an arithmetic number, because the mean of its divisors is an integer number (32310009).

Almost surely, 2^665151166 is an apocalyptic number.

665151166 is a deficient number, since it is larger than the sum of its proper divisors (368769122).

665151166 is a wasteful number, since it uses less digits than its factorization.

665151166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636.

The product of its digits is 32400, while the sum is 37.

The square root of 665151166 is about 25790.5247329324. The cubic root of 665151166 is about 872.9180066162.

The spelling of 665151166 in words is "six hundred sixty-five million, one hundred fifty-one thousand, one hundred sixty-six".