15991909760 has 32 divisors (see below), whose sum is σ = 38230660800. Its totient is φ = 6396763648.

The previous prime is 15991909733. The next prime is 15991909763. The reversal of 15991909760 is 6790919951.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 15991909696 and 15991909705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15991909763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12493040 + ... + 12494319.

It is an arithmetic number, because the mean of its divisors is an integer number (1194708150).

Almost surely, 2^15991909760 is an apocalyptic number.

15991909760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15991909760 is an abundant number, since it is smaller than the sum of its proper divisors (22238751040).

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

15991909760 is an equidigital number, since it uses as much as digits as its factorization.

15991909760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24987378 (or 24987366 counting only the distinct ones).

The product of its (nonzero) digits is 1377810, while the sum is 56.

The spelling of 15991909760 in words is "fifteen billion, nine hundred ninety-one million, nine hundred nine thousand, seven hundred sixty".