15998727443 has 4 divisors (see below), whose sum is σ = 16431125520. Its totient is φ = 15566329368.

The previous prime is 15998727431. The next prime is 15998727449. The reversal of 15998727443 is 34472789951.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15998727443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15998727449) 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, 216198983 + ... + 216199056.

It is an arithmetic number, because the mean of its divisors is an integer number (4107781380).

Almost surely, 2^15998727443 is an apocalyptic number.

15998727443 is a deficient number, since it is larger than the sum of its proper divisors (432398077).

15998727443 is an equidigital number, since it uses as much as digits as its factorization.

15998727443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432398076.

The product of its digits is 15240960, while the sum is 59.

The spelling of 15998727443 in words is "fifteen billion, nine hundred ninety-eight million, seven hundred twenty-seven thousand, four hundred forty-three".