331385836655 has 4 divisors (see below), whose sum is σ = 397663003992. Its totient is φ = 265108669320.

The previous prime is 331385836643. The next prime is 331385836667. The reversal of 331385836655 is 556638583133.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (331385836643) and next prime (331385836667).

It is not a de Polignac number, because 331385836655 - 2²⁰ = 331384788079 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 331385836655.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 33138583661 + ... + 33138583670.

It is an arithmetic number, because the mean of its divisors is an integer number (99415750998).

Almost surely, 2^331385836655 is an apocalyptic number.

331385836655 is a deficient number, since it is larger than the sum of its proper divisors (66277167337).

331385836655 is an equidigital number, since it uses as much as digits as its factorization.

331385836655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66277167336.

The product of its digits is 23328000, while the sum is 56.

The spelling of 331385836655 in words is "three hundred thirty-one billion, three hundred eighty-five million, eight hundred thirty-six thousand, six hundred fifty-five".