331665665 has 32 divisors (see below), whose sum is σ = 435891456. Its totient is φ = 241274880.

The previous prime is 331665661. The next prime is 331665671. The reversal of 331665665 is 566566133.

It is not a de Polignac number, because 331665665 - 2² = 331665661 is a prime.

It is a super-2 number, since 2×331665665² = 220004226679784450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331665661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 376025 + ... + 376905.

It is an arithmetic number, because the mean of its divisors is an integer number (13621608).

Almost surely, 2^331665665 is an apocalyptic number.

It is an amenable number.

331665665 is a deficient number, since it is larger than the sum of its proper divisors (104225791).

331665665 is a wasteful number, since it uses less digits than its factorization.

331665665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049.

The product of its digits is 291600, while the sum is 41.

The square root of 331665665 is about 18211.6903389005. The cubic root of 331665665 is about 692.2030440129.

It can be divided in two parts, 33 and 1665665, that multiplied together give a palindrome (54966945).

The spelling of 331665665 in words is "three hundred thirty-one million, six hundred sixty-five thousand, six hundred sixty-five".