12499559646 has 96 divisors (see below), whose sum is σ = 29561495040. Its totient is φ = 3512605824.

The previous prime is 12499559623. The next prime is 12499559647. The reversal of 12499559646 is 64695599421.

It is a self number, because there is not a number n which added to its sum of digits gives 12499559646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12499559647) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7129506 + ... + 7131258.

It is an arithmetic number, because the mean of its divisors is an integer number (307932240).

Almost surely, 2^12499559646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12499559646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14780747520).

12499559646 is an abundant number, since it is smaller than the sum of its proper divisors (17061935394).

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

12499559646 is a wasteful number, since it uses less digits than its factorization.

12499559646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158 (or 2151 counting only the distinct ones).

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

The spelling of 12499559646 in words is "twelve billion, four hundred ninety-nine million, five hundred fifty-nine thousand, six hundred forty-six".