15728728585873 has 4 divisors (see below), whose sum is σ = 16271098537140. Its totient is φ = 15186358634608.

The previous prime is 15728728585769. The next prime is 15728728585883. The reversal of 15728728585873 is 37858582782751.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12737132863744 + 2991595722129 = 3568912^2 + 1729623^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15728728585873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15728728585873.

It is not an unprimeable number, because it can be changed into a prime (15728728585883) 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, 271184975590 + ... + 271184975647.

It is an arithmetic number, because the mean of its divisors is an integer number (4067774634285).

Almost surely, 2^{15728728585873} is an apocalyptic number.

It is an amenable number.

15728728585873 is a deficient number, since it is larger than the sum of its proper divisors (542369951267).

15728728585873 is an equidigital number, since it uses as much as digits as its factorization.

15728728585873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542369951266.

The product of its digits is 2107392000, while the sum is 76.

The spelling of 15728728585873 in words is "fifteen trillion, seven hundred twenty-eight billion, seven hundred twenty-eight million, five hundred eighty-five thousand, eight hundred seventy-three".