15997051327 has 4 divisors (see below), whose sum is σ = 16004185560. Its totient is φ = 15989917096.

The previous prime is 15997051283. The next prime is 15997051331. The reversal of 15997051327 is 72315079951.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72315079951 = 4513 ⋅16023727.

It is a cyclic number.

It is not a de Polignac number, because 15997051327 - 2¹⁹ = 15996527039 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15997051337) 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, 3563752 + ... + 3568237.

It is an arithmetic number, because the mean of its divisors is an integer number (4001046390).

Almost surely, 2^15997051327 is an apocalyptic number.

15997051327 is a deficient number, since it is larger than the sum of its proper divisors (7134233).

15997051327 is an equidigital number, since it uses as much as digits as its factorization.

15997051327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7134232.

The product of its (nonzero) digits is 595350, while the sum is 49.

The spelling of 15997051327 in words is "fifteen billion, nine hundred ninety-seven million, fifty-one thousand, three hundred twenty-seven".