12499001856 has 360 divisors, whose sum is σ = 41070769740. Its totient is φ = 3652239360.

The previous prime is 12499001839. The next prime is 12499001863. The reversal of 12499001856 is 65810099421.

It can be written as a sum of positive squares in 2 ways, for example, as 11715897600 + 783104256 = 108240^2 + 27984^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16169086 + ... + 16169858.

Almost surely, 2^12499001856 is an apocalyptic number.

12499001856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12499001856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20535384870).

12499001856 is an abundant number, since it is smaller than the sum of its proper divisors (28571767884).

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

12499001856 is a wasteful number, since it uses less digits than its factorization.

12499001856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848 (or 818 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 12499001856 in words is "twelve billion, four hundred ninety-nine million, one thousand, eight hundred fifty-six".