15328721857973 has 2 divisors, whose sum is σ = 15328721857974. Its totient is φ = 15328721857972.

The previous prime is 15328721857963. The next prime is 15328721857991. The reversal of 15328721857973 is 37975812782351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15326340222769 + 2381635204 = 3914887^2 + 48802^2 .

It is a cyclic number.

It is not a de Polignac number, because 15328721857973 - 2⁶ = 15328721857909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15328721857963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7664360928986 + 7664360928987.

It is an arithmetic number, because the mean of its divisors is an integer number (7664360928987).

Almost surely, 2^{15328721857973} is an apocalyptic number.

It is an amenable number.

15328721857973 is a deficient number, since it is larger than the sum of its proper divisors (1).

15328721857973 is an equidigital number, since it uses as much as digits as its factorization.

15328721857973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 177811200, while the sum is 68.

The spelling of 15328721857973 in words is "fifteen trillion, three hundred twenty-eight billion, seven hundred twenty-one million, eight hundred fifty-seven thousand, nine hundred seventy-three".