331665012 has 144 divisors (see below), whose sum is σ = 985525632. Its totient is φ = 92102400.

The previous prime is 331664987. The next prime is 331665013. The reversal of 331665012 is 210566133.

331665012 is a `hidden beast` number, since 3 + 3 + 1 + 6 + 650 + 1 + 2 = 666.

It is a super-2 number, since 2×331665012² = 220003360369920288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331665013) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2112438 + ... + 2112594.

It is an arithmetic number, because the mean of its divisors is an integer number (6843928).

Almost surely, 2^331665012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 331665012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (492762816).

331665012 is an abundant number, since it is smaller than the sum of its proper divisors (653860620).

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

331665012 is a wasteful number, since it uses less digits than its factorization.

331665012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358 (or 353 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 331665012 is about 18211.6724108468. The cubic root of 331665012 is about 692.2025897313.

The spelling of 331665012 in words is "three hundred thirty-one million, six hundred sixty-five thousand, twelve".