15912391680 has 880 divisors, whose sum is σ = 63023461776. Its totient is φ = 3822059520.

The previous prime is 15912391673. The next prime is 15912391711. The reversal of 15912391680 is 8619321951.

It can be written as a sum of positive squares in 8 ways, for example, as 82944 + 15912308736 = 288^2 + 126144^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 260858850 + ... + 260858910.

Almost surely, 2^15912391680 is an apocalyptic number.

15912391680 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 15912391680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31511730888).

15912391680 is an abundant number, since it is smaller than the sum of its proper divisors (47111070096).

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

15912391680 is a wasteful number, since it uses less digits than its factorization.

15912391680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The spelling of 15912391680 in words is "fifteen billion, nine hundred twelve million, three hundred ninety-one thousand, six hundred eighty".