331843778813 has 4 divisors (see below), whose sum is σ = 332610162108. Its totient is φ = 331077395520.

The previous prime is 331843778711. The next prime is 331843778821. The reversal of 331843778813 is 318877348133.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12462819769 + 319380959044 = 111637^2 + 565138^2 .

It is a cyclic number.

It is not a de Polignac number, because 331843778813 - 2¹⁴ = 331843762429 is a prime.

It is a super-2 number, since 2×331843778813² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331843774813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383190998 + ... + 383191863.

It is an arithmetic number, because the mean of its divisors is an integer number (83152540527).

Almost surely, 2^331843778813 is an apocalyptic number.

It is an amenable number.

331843778813 is a deficient number, since it is larger than the sum of its proper divisors (766383295).

331843778813 is an equidigital number, since it uses as much as digits as its factorization.

331843778813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766383294.

The product of its digits is 8128512, while the sum is 56.

The spelling of 331843778813 in words is "three hundred thirty-one billion, eight hundred forty-three million, seven hundred seventy-eight thousand, eight hundred thirteen".