12599998561 has 32 divisors (see below), whose sum is σ = 13916390400. Its totient is φ = 11361772800.

The previous prime is 12599998559. The next prime is 12599998573. The reversal of 12599998561 is 16589999521.

It is not a de Polignac number, because 12599998561 - 2¹ = 12599998559 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12599998493 and 12599998502.

It is not an unprimeable number, because it can be changed into a prime (12599998361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20757520 + ... + 20758126.

It is an arithmetic number, because the mean of its divisors is an integer number (434887200).

Almost surely, 2^12599998561 is an apocalyptic number.

It is an amenable number.

12599998561 is a deficient number, since it is larger than the sum of its proper divisors (1316391839).

12599998561 is a wasteful number, since it uses less digits than its factorization.

12599998561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129.

The product of its digits is 15746400, while the sum is 64.

The spelling of 12599998561 in words is "twelve billion, five hundred ninety-nine million, nine hundred ninety-eight thousand, five hundred sixty-one".