331644643331 has 16 divisors (see below), whose sum is σ = 344153671680. Its totient is φ = 319252285440.

The previous prime is 331644643279. The next prime is 331644643333. The reversal of 331644643331 is 133346446133.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331644643331 is a prime.

It is a super-2 number, since 2×331644643331² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331644643333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5763380 + ... + 5820638.

It is an arithmetic number, because the mean of its divisors is an integer number (21509604480).

Almost surely, 2^331644643331 is an apocalyptic number.

331644643331 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

331644643331 is a deficient number, since it is larger than the sum of its proper divisors (12509028349).

331644643331 is a wasteful number, since it uses less digits than its factorization.

331644643331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58274.

The product of its digits is 559872, while the sum is 41.

The spelling of 331644643331 in words is "three hundred thirty-one billion, six hundred forty-four million, six hundred forty-three thousand, three hundred thirty-one".