15991809048576 has 459 divisors, whose sum is σ = 47728265111553. Its totient is φ = 5159638794240.

The previous prime is 15991809048563. The next prime is 15991809048577. The reversal of 15991809048576 is 67584090819951.

The square root of 15991809048576 is 3998976.

It is a perfect power (a square), and thus also a powerful number.

15991809048576 is a `hidden beast` number, since 1 + 5 + 9 + 9 + 1 + 8 + 0 + 9 + 0 + 48 + 576 = 666.

It can be written as a sum of positive squares in only one way, i.e., 770574974976 + 15221234073600 = 877824^2 + 3901440^2 .

It is a super-2 number, since 2×15991809048576² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (15991809048577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 125919756225 + ... + 125919756351.

Almost surely, 2^{15991809048576} is an apocalyptic number.

15991809048576 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

15991809048576 is the 3998976-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15991809048576

15991809048576 is an abundant number, since it is smaller than the sum of its proper divisors (31736456062977).

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

15991809048576 is an frugal number, since it uses more digits than its factorization.

15991809048576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 195955200, while the sum is 72.

The spelling of 15991809048576 in words is "fifteen trillion, nine hundred ninety-one billion, eight hundred nine million, forty-eight thousand, five hundred seventy-six".