15805045509136 has 75 divisors (see below), whose sum is σ = 33179684476353. Its totient is φ = 7293396015360.

The previous prime is 15805045509079. The next prime is 15805045509173. The reversal of 15805045509136 is 63190554050851.

The square root of 15805045509136 is 3975556.

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

It can be written as a sum of positive squares in 7 ways, for example, as 13746624030736 + 2058421478400 = 3707644^2 + 1434720^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 2687472916 + ... + 2687478796.

Almost surely, 2^{15805045509136} is an apocalyptic number.

15805045509136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

15805045509136 is the 3975556-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15805045509136

15805045509136 is an abundant number, since it is smaller than the sum of its proper divisors (17374638967217).

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

15805045509136 is an frugal number, since it uses more digits than its factorization.

15805045509136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11822 (or 5896 counting only the distinct ones).

The product of its (nonzero) digits is 3240000, while the sum is 52.

Adding to 15805045509136 its reverse (63190554050851), we get a palindrome (78995599559987).

The spelling of 15805045509136 in words is "fifteen trillion, eight hundred five billion, forty-five million, five hundred nine thousand, one hundred thirty-six".