13365256331 has 8 divisors (see below), whose sum is σ = 15767307264. Its totient is φ = 11086387560.

The previous prime is 13365256321. The next prime is 13365256357.

13365256331 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13365256331 is a prime.

It is a super-2 number, since 2×13365256331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13365256321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30795305 + ... + 30795738.

It is an arithmetic number, because the mean of its divisors is an integer number (1970913408).

Almost surely, 2^13365256331 is an apocalyptic number.

13365256331 is a deficient number, since it is larger than the sum of its proper divisors (2402050933).

13365256331 is an equidigital number, since it uses as much as digits as its factorization.

13365256331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61591081.

The product of its digits is 145800, while the sum is 38.

The spelling of 13365256331 in words is "thirteen billion, three hundred sixty-five million, two hundred fifty-six thousand, three hundred thirty-one".