13220665700 has 108 divisors (see below), whose sum is σ = 31749986100. Its totient is φ = 4774598400.

The previous prime is 13220665691. The next prime is 13220665729. The reversal of 13220665700 is 756602231.

It can be written as a sum of positive squares in 6 ways, for example, as 5634604096 + 7586061604 = 75064^2 + 87098^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1799234 + ... + 1806566.

Almost surely, 2^13220665700 is an apocalyptic number.

13220665700 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 13220665700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15874993050).

13220665700 is an abundant number, since it is smaller than the sum of its proper divisors (18529320400).

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

13220665700 is a wasteful number, since it uses less digits than its factorization.

13220665700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7518 (or 7500 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The spelling of 13220665700 in words is "thirteen billion, two hundred twenty million, six hundred sixty-five thousand, seven hundred".