665661146 has 16 divisors (see below), whose sum is σ = 1059355584. Its totient is φ = 312621504.

The previous prime is 665661121. The next prime is 665661149. The reversal of 665661146 is 641166566.

It is a super-2 number, since 2×665661146² = 886209522588066632, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (665661149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2360 + ... + 36563.

It is an arithmetic number, because the mean of its divisors is an integer number (66209724).

Almost surely, 2^665661146 is an apocalyptic number.

665661146 is a deficient number, since it is larger than the sum of its proper divisors (393694438).

665661146 is a wasteful number, since it uses less digits than its factorization.

665661146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39445.

The product of its digits is 155520, while the sum is 41.

The square root of 665661146 is about 25800.4098029469. The cubic root of 665661146 is about 873.1410421323.

The spelling of 665661146 in words is "six hundred sixty-five million, six hundred sixty-one thousand, one hundred forty-six".