12599944665 has 128 divisors (see below), whose sum is σ = 26305523712. Its totient is φ = 4997790720.

The previous prime is 12599944631. The next prime is 12599944697. The reversal of 12599944665 is 56644999521.

It is not a de Polignac number, because 12599944665 - 2⁹ = 12599944153 is a prime.

It is a super-2 number, since 2×12599944665² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12599944599 and 12599944608.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2262174 + ... + 2267736.

It is an arithmetic number, because the mean of its divisors is an integer number (205511904).

Almost surely, 2^12599944665 is an apocalyptic number.

12599944665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12599944665 is an abundant number, since it is smaller than the sum of its proper divisors (13705579047).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12599944665 is a wasteful number, since it uses less digits than its factorization.

12599944665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5679.

The product of its digits is 20995200, while the sum is 60.

The spelling of 12599944665 in words is "twelve billion, five hundred ninety-nine million, nine hundred forty-four thousand, six hundred sixty-five".