12881653781 has 4 divisors (see below), whose sum is σ = 12882236364. Its totient is φ = 12881071200.

The previous prime is 12881653751. The next prime is 12881653819. The reversal of 12881653781 is 18735618821.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1701975025 + 11179678756 = 41255^2 + 105734^2 .

It is a cyclic number.

It is not a de Polignac number, because 12881653781 - 2²² = 12877459477 is a prime.

It is a super-2 number, since 2×12881653781² (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 (12881653751) 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, 256760 + ... + 302801.

It is an arithmetic number, because the mean of its divisors is an integer number (3220559091).

Almost surely, 2^12881653781 is an apocalyptic number.

It is an amenable number.

12881653781 is a deficient number, since it is larger than the sum of its proper divisors (582583).

12881653781 is an equidigital number, since it uses as much as digits as its factorization.

12881653781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582582.

The product of its digits is 645120, while the sum is 50.

The spelling of 12881653781 in words is "twelve billion, eight hundred eighty-one million, six hundred fifty-three thousand, seven hundred eighty-one".