12899450881 has 4 divisors (see below), whose sum is σ = 12947404500. Its totient is φ = 12851497264.

The previous prime is 12899450867. The next prime is 12899450903. The reversal of 12899450881 is 18805499821.

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 446899600 + 12452551281 = 21140^2 + 111591^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12899450881 is a prime.

It is a super-2 number, since 2×12899450881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12899430881) 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, 23976406 + ... + 23976943.

It is an arithmetic number, because the mean of its divisors is an integer number (3236851125).

It is a Proth number, since it is equal to 98415 ⋅ 2¹⁷ + 1 and 98415 < 2¹⁷.

Almost surely, 2^12899450881 is an apocalyptic number.

It is an amenable number.

12899450881 is a deficient number, since it is larger than the sum of its proper divisors (47953619).

12899450881 is an equidigital number, since it uses as much as digits as its factorization.

12899450881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47953618.

The product of its (nonzero) digits is 1658880, while the sum is 55.

The spelling of 12899450881 in words is "twelve billion, eight hundred ninety-nine million, four hundred fifty thousand, eight hundred eighty-one".