12661660000 has 240 divisors, whose sum is σ = 34528697280. Its totient is φ = 4530240000.

The previous prime is 12661659991. The next prime is 12661660019. The reversal of 12661660000 is 6616621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 14739571 + ... + 14740429.

It is an arithmetic number, because the mean of its divisors is an integer number (143869572).

Almost surely, 2^12661660000 is an apocalyptic number.

12661660000 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 12661660000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17264348640).

12661660000 is an abundant number, since it is smaller than the sum of its proper divisors (21867037280).

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

12661660000 is an equidigital number, since it uses as much as digits as its factorization.

12661660000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 967 (or 944 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 12661660000 in words is "twelve billion, six hundred sixty-one million, six hundred sixty thousand".