1326727778631 has 4 divisors (see below), whose sum is σ = 1768970371512. Its totient is φ = 884485185752.

The previous prime is 1326727778627. The next prime is 1326727778659. The reversal of 1326727778631 is 1368777276231.

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 1326727778631 - 2² = 1326727778627 is a prime.

It is a super-2 number, since 2×1326727778631² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1326727770631) 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, 221121296436 + ... + 221121296441.

It is an arithmetic number, because the mean of its divisors is an integer number (442242592878).

Almost surely, 2^{1326727778631} is an apocalyptic number.

1326727778631 is a deficient number, since it is larger than the sum of its proper divisors (442242592881).

1326727778631 is an equidigital number, since it uses as much as digits as its factorization.

1326727778631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442242592880.

The product of its digits is 24893568, while the sum is 60.

The spelling of 1326727778631 in words is "one trillion, three hundred twenty-six billion, seven hundred twenty-seven million, seven hundred seventy-eight thousand, six hundred thirty-one".