13220007256631 has 4 divisors (see below), whose sum is σ = 15108579721872. Its totient is φ = 11331434791392.

The previous prime is 13220007256619. The next prime is 13220007256637. The reversal of 13220007256631 is 13665270002231.

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

It is a cyclic number.

It is not a de Polignac number, because 13220007256631 - 2²⁶ = 13219940147767 is a prime.

It is a super-2 number, since 2×13220007256631² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220007256637) 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, 944286232610 + ... + 944286232623.

It is an arithmetic number, because the mean of its divisors is an integer number (3777144930468).

Almost surely, 2^{13220007256631} is an apocalyptic number.

13220007256631 is a deficient number, since it is larger than the sum of its proper divisors (1888572465241).

13220007256631 is an equidigital number, since it uses as much as digits as its factorization.

13220007256631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1888572465240.

The product of its (nonzero) digits is 90720, while the sum is 38.

Adding to 13220007256631 its reverse (13665270002231), we get a palindrome (26885277258862).

The spelling of 13220007256631 in words is "thirteen trillion, two hundred twenty billion, seven million, two hundred fifty-six thousand, six hundred thirty-one".