15997674523 has 4 divisors (see below), whose sum is σ = 16049784520. Its totient is φ = 15945564528.

The previous prime is 15997674481. The next prime is 15997674529. The reversal of 15997674523 is 32547679951.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 15997674523 - 2¹³ = 15997666331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15997674529) 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, 26054538 + ... + 26055151.

It is an arithmetic number, because the mean of its divisors is an integer number (4012446130).

Almost surely, 2^15997674523 is an apocalyptic number.

15997674523 is a deficient number, since it is larger than the sum of its proper divisors (52109997).

15997674523 is an equidigital number, since it uses as much as digits as its factorization.

15997674523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52109996.

The product of its digits is 14288400, while the sum is 58.

The spelling of 15997674523 in words is "fifteen billion, nine hundred ninety-seven million, six hundred seventy-four thousand, five hundred twenty-three".