331991554212 has 72 divisors (see below), whose sum is σ = 868582915200. Its totient is φ = 106793201088.

The previous prime is 331991554207. The next prime is 331991554231. The reversal of 331991554212 is 212455199133.

331991554212 is a `hidden beast` number, since 3 + 3 + 1 + 9 + 91 + 5 + 542 + 12 = 666.

It is a super-2 number, since 2×331991554212² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1985733 + ... + 2146419.

It is an arithmetic number, because the mean of its divisors is an integer number (12063651600).

Almost surely, 2^331991554212 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 331991554212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (434291457600).

331991554212 is an abundant number, since it is smaller than the sum of its proper divisors (536591360988).

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

331991554212 is a wasteful number, since it uses less digits than its factorization.

331991554212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162705 (or 162700 counting only the distinct ones).

The product of its digits is 291600, while the sum is 45.

The spelling of 331991554212 in words is "three hundred thirty-one billion, nine hundred ninety-one million, five hundred fifty-four thousand, two hundred twelve".