12699929856 has 72 divisors (see below), whose sum is σ = 33823703200. Its totient is φ = 4230383616.

The previous prime is 12699929843. The next prime is 12699929887. The reversal of 12699929856 is 65892999621.

It is a super-2 number, since 2×12699929856² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1299966 + ... + 1309698.

Almost surely, 2^12699929856 is an apocalyptic number.

12699929856 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 12699929856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16911851600).

12699929856 is an abundant number, since it is smaller than the sum of its proper divisors (21123773344).

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

12699929856 is an equidigital number, since it uses as much as digits as its factorization.

12699929856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11451 (or 11437 counting only the distinct ones).

The product of its digits is 37791360, while the sum is 66.

The spelling of 12699929856 in words is "twelve billion, six hundred ninety-nine million, nine hundred twenty-nine thousand, eight hundred fifty-six".