331665666 has 8 divisors (see below), whose sum is σ = 663331344. Its totient is φ = 110555220.

The previous prime is 331665661. The next prime is 331665671. The reversal of 331665666 is 666566133.

It is an interprime number because it is at equal distance from previous prime (331665661) and next prime (331665671).

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

331665666 is an admirable number.

It is a super-2 number, since 2×331665666² = 220004228006447112, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 27638800 + ... + 27638811.

It is an arithmetic number, because the mean of its divisors is an integer number (82916418).

Almost surely, 2^331665666 is an apocalyptic number.

331665666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

331665666 is a wasteful number, since it uses less digits than its factorization.

331665666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55277616.

The product of its digits is 349920, while the sum is 42.

The square root of 331665666 is about 18211.6903663553. The cubic root of 331665666 is about 692.2030447086.

The spelling of 331665666 in words is "three hundred thirty-one million, six hundred sixty-five thousand, six hundred sixty-six".