12368815381 has 4 divisors (see below), whose sum is σ = 13320262732. Its totient is φ = 11417368032.

The previous prime is 12368815379. The next prime is 12368815397. The reversal of 12368815381 is 18351886321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18351886321 = 151 ⋅121535671.

It can be written as a sum of positive squares in 2 ways, for example, as 6330748356 + 6038067025 = 79566^2 + 77705^2 .

It is a cyclic number.

It is not a de Polignac number, because 12368815381 - 2¹ = 12368815379 is a prime.

It is a super-2 number, since 2×12368815381² (a number of 21 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 (12368815321) 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, 475723656 + ... + 475723681.

It is an arithmetic number, because the mean of its divisors is an integer number (3330065683).

Almost surely, 2^12368815381 is an apocalyptic number.

It is an amenable number.

12368815381 is a deficient number, since it is larger than the sum of its proper divisors (951447351).

12368815381 is an equidigital number, since it uses as much as digits as its factorization.

12368815381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951447350.

The product of its digits is 276480, while the sum is 46.

The spelling of 12368815381 in words is "twelve billion, three hundred sixty-eight million, eight hundred fifteen thousand, three hundred eighty-one".