12877937381 has 4 divisors (see below), whose sum is σ = 12880739712. Its totient is φ = 12875135052.

The previous prime is 12877937351. The next prime is 12877937389. The reversal of 12877937381 is 18373977821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18373977821 = 89 ⋅206449189.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12877937381 is a prime.

It is a super-2 number, since 2×12877937381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12877937389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1394261 + ... + 1403466.

It is an arithmetic number, because the mean of its divisors is an integer number (3220184928).

Almost surely, 2^12877937381 is an apocalyptic number.

It is an amenable number.

12877937381 is a deficient number, since it is larger than the sum of its proper divisors (2802331).

12877937381 is an equidigital number, since it uses as much as digits as its factorization.

12877937381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2802330.

The product of its digits is 3556224, while the sum is 56.

The spelling of 12877937381 in words is "twelve billion, eight hundred seventy-seven million, nine hundred thirty-seven thousand, three hundred eighty-one".