12888780381 has 12 divisors (see below), whose sum is σ = 18620444700. Its totient is φ = 8590989120.

The previous prime is 12888780349. The next prime is 12888780391. The reversal of 12888780381 is 18308788821.

It can be written as a sum of positive squares in 2 ways, for example, as 9325764900 + 3563015481 = 96570^2 + 59691^2 .

It is not a de Polignac number, because 12888780381 - 2⁵ = 12888780349 is a prime.

It is a super-2 number, since 2×12888780381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12888780301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73056 + ... + 176393.

It is an arithmetic number, because the mean of its divisors is an integer number (1551703725).

Almost surely, 2^12888780381 is an apocalyptic number.

It is an amenable number.

12888780381 is a deficient number, since it is larger than the sum of its proper divisors (5731664319).

12888780381 is a wasteful number, since it uses less digits than its factorization.

12888780381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255196 (or 255193 counting only the distinct ones).

The product of its (nonzero) digits is 1376256, while the sum is 54.

The spelling of 12888780381 in words is "twelve billion, eight hundred eighty-eight million, seven hundred eighty thousand, three hundred eighty-one".