12220779520 has 176 divisors, whose sum is σ = 30831553728. Its totient is φ = 4638965760.

The previous prime is 12220779509. The next prime is 12220779541. The reversal of 12220779520 is 2597702221.

It is a self number, because there is not a number n which added to its sum of digits gives 12220779520.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18487990 + ... + 18488650.

Almost surely, 2^12220779520 is an apocalyptic number.

12220779520 is a gapful number since it is divisible by the number (10) 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 12220779520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15415776864).

12220779520 is an abundant number, since it is smaller than the sum of its proper divisors (18610774208).

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

12220779520 is a wasteful number, since it uses less digits than its factorization.

12220779520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866 (or 848 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 37.

The spelling of 12220779520 in words is "twelve billion, two hundred twenty million, seven hundred seventy-nine thousand, five hundred twenty".