15979796989920 has 384 divisors, whose sum is σ = 56674951119360. Its totient is φ = 4257126720000.

The previous prime is 15979796989913. The next prime is 15979796989957. The reversal of 15979796989920 is 2998969797951.

15979796989920 is a `hidden beast` number, since 1 + 597 + 9 + 7 + 9 + 6 + 9 + 8 + 9 + 9 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (90).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 367744195 + ... + 367787645.

It is an arithmetic number, because the mean of its divisors is an integer number (147591018540).

Almost surely, 2^{15979796989920} is an apocalyptic number.

15979796989920 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 15979796989920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28337475559680).

15979796989920 is an abundant number, since it is smaller than the sum of its proper divisors (40695154129440).

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

15979796989920 is an equidigital number, since it uses as much as digits as its factorization.

15979796989920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44538 (or 44512 counting only the distinct ones).

The product of its (nonzero) digits is 12499492320, while the sum is 90.

The spelling of 15979796989920 in words is "fifteen trillion, nine hundred seventy-nine billion, seven hundred ninety-six million, nine hundred eighty-nine thousand, nine hundred twenty".