15991766880 has 96 divisors (see below), whose sum is σ = 50430739968. Its totient is φ = 4259673600.

The previous prime is 15991766851. The next prime is 15991766927. The reversal of 15991766880 is 8866719951.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 418995 + ... + 455565.

It is an arithmetic number, because the mean of its divisors is an integer number (525320208).

Almost surely, 2^15991766880 is an apocalyptic number.

15991766880 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 15991766880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25215369984).

15991766880 is an abundant number, since it is smaller than the sum of its proper divisors (34438973088).

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

15991766880 is a wasteful number, since it uses less digits than its factorization.

15991766880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37500 (or 37492 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 60.

The spelling of 15991766880 in words is "fifteen billion, nine hundred ninety-one million, seven hundred sixty-six thousand, eight hundred eighty".