12881557989 has 12 divisors (see below), whose sum is σ = 18608892172. Its totient is φ = 8586691200.

The previous prime is 12881557973. The next prime is 12881557991. The reversal of 12881557989 is 98975518821.

It can be written as a sum of positive squares in 2 ways, for example, as 11495485089 + 1386072900 = 107217^2 + 37230^2 .

It is not a de Polignac number, because 12881557989 - 2⁴ = 12881557973 is a prime.

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 (12881552989) 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, 429 + ... + 160509.

Almost surely, 2^12881557989 is an apocalyptic number.

It is an amenable number.

12881557989 is a deficient number, since it is larger than the sum of its proper divisors (5727334183).

12881557989 is a wasteful number, since it uses less digits than its factorization.

12881557989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169028 (or 169025 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 63.

The spelling of 12881557989 in words is "twelve billion, eight hundred eighty-one million, five hundred fifty-seven thousand, nine hundred eighty-nine".