6440306404331 has 2 divisors, whose sum is σ = 6440306404332. Its totient is φ = 6440306404330.

The previous prime is 6440306404199. The next prime is 6440306404333. The reversal of 6440306404331 is 1334046030446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6440306404331 - 2³⁸ = 6165428497387 is a prime.

It is a super-2 number, since 2×6440306404331² (a number of 26 digits) contains 22 as substring.

Together with 6440306404333, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6440306404333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220153202165 + 3220153202166.

It is an arithmetic number, because the mean of its divisors is an integer number (3220153202166).

Almost surely, 2^{6440306404331} is an apocalyptic number.

6440306404331 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440306404331 is an equidigital number, since it uses as much as digits as its factorization.

6440306404331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 38.

The spelling of 6440306404331 in words is "six trillion, four hundred forty billion, three hundred six million, four hundred four thousand, three hundred thirty-one".