15998497581338 has 8 divisors (see below), whose sum is σ = 24025879723188. Its totient is φ = 7989871006944.

The previous prime is 15998497581317. The next prime is 15998497581379. The reversal of 15998497581338 is 83318579489951.

15998497581338 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 13654037448769 + 2344460132569 = 3695137^2 + 1531163^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4688889731 + ... + 4688893142.

Almost surely, 2^{15998497581338} is an apocalyptic number.

15998497581338 is a deficient number, since it is larger than the sum of its proper divisors (8027382141850).

15998497581338 is an equidigital number, since it uses as much as digits as its factorization.

15998497581338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9377783728.

The product of its digits is 2351462400, while the sum is 80.

The spelling of 15998497581338 in words is "fifteen trillion, nine hundred ninety-eight billion, four hundred ninety-seven million, five hundred eighty-one thousand, three hundred thirty-eight".