15991785606368 has 288 divisors, whose sum is σ = 37589910019200. Its totient is φ = 6652063503360.

The previous prime is 15991785606343. The next prime is 15991785606409. The reversal of 15991785606368 is 86360658719951.

It is a junction number, because it is equal to n+sod(n) for n = 15991785606295 and 15991785606304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7129640255 + ... + 7129642497.

It is an arithmetic number, because the mean of its divisors is an integer number (130520520900).

Almost surely, 2^{15991785606368} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15991785606368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18794955009600).

15991785606368 is an abundant number, since it is smaller than the sum of its proper divisors (21598124412832).

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

15991785606368 is a wasteful number, since it uses less digits than its factorization.

15991785606368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3446 (or 3427 counting only the distinct ones).

The product of its (nonzero) digits is 587865600, while the sum is 74.

The spelling of 15991785606368 in words is "fifteen trillion, nine hundred ninety-one billion, seven hundred eighty-five million, six hundred six thousand, three hundred sixty-eight".