15843242721561 has 8 divisors (see below), whose sum is σ = 21127661357280. Its totient is φ = 10560492950112.

The previous prime is 15843242721521. The next prime is 15843242721563. The reversal of 15843242721561 is 16512724234851.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 15843242721561 - 2¹⁴ = 15843242705177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15843242721563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 417193915 + ... + 417231888.

It is an arithmetic number, because the mean of its divisors is an integer number (2640957669660).

Almost surely, 2^{15843242721561} is an apocalyptic number.

It is an amenable number.

15843242721561 is a deficient number, since it is larger than the sum of its proper divisors (5284418635719).

15843242721561 is an equidigital number, since it uses as much as digits as its factorization.

15843242721561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834432135.

The product of its digits is 3225600, while the sum is 51.

The spelling of 15843242721561 in words is "fifteen trillion, eight hundred forty-three billion, two hundred forty-two million, seven hundred twenty-one thousand, five hundred sixty-one".