11966997680 has 160 divisors (see below), whose sum is σ = 32282219520. Its totient is φ = 4077301760.

The previous prime is 11966997643. The next prime is 11966997683. The reversal of 11966997680 is 8679966911.

It is not an unprimeable number, because it can be changed into a prime (11966997683) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3573767 + ... + 3577113.

It is an arithmetic number, because the mean of its divisors is an integer number (201763872).

Almost surely, 2^11966997680 is an apocalyptic number.

11966997680 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 11966997680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16141109760).

11966997680 is an abundant number, since it is smaller than the sum of its proper divisors (20315221840).

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

11966997680 is a wasteful number, since it uses less digits than its factorization.

11966997680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3627 (or 3621 counting only the distinct ones).

The product of its (nonzero) digits is 8817984, while the sum is 62.

The spelling of 11966997680 in words is "eleven billion, nine hundred sixty-six million, nine hundred ninety-seven thousand, six hundred eighty".