12998891057 has 4 divisors (see below), whose sum is σ = 13076728896. Its totient is φ = 12921053220.

The previous prime is 12998891051. The next prime is 12998891063. The reversal of 12998891057 is 75019889921.

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.

It is an interprime number because it is at equal distance from previous prime (12998891051) and next prime (12998891063).

It is a cyclic number.

It is not a de Polignac number, because 12998891057 - 2¹⁸ = 12998628913 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12998890987 and 12998891005.

It is not an unprimeable number, because it can be changed into a prime (12998891051) 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, 38918669 + ... + 38919002.

It is an arithmetic number, because the mean of its divisors is an integer number (3269182224).

Almost surely, 2^12998891057 is an apocalyptic number.

It is an amenable number.

12998891057 is a deficient number, since it is larger than the sum of its proper divisors (77837839).

12998891057 is an equidigital number, since it uses as much as digits as its factorization.

12998891057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77837838.

The product of its (nonzero) digits is 3265920, while the sum is 59.

The spelling of 12998891057 in words is "twelve billion, nine hundred ninety-eight million, eight hundred ninety-one thousand, fifty-seven".