15996504190969 has 3 divisors (see below), whose sum is σ = 15996508190533. Its totient is φ = 15996500191406.

The previous prime is 15996504190957. The next prime is 15996504190999. The reversal of 15996504190969 is 96909140569951.

The square root of 15996504190969 is 3999563.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 15996504190969 - 2¹⁹ = 15996503666681 is a prime.

It is a super-2 number, since 2×15996504190969² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15996504190949) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1999782 + ... + 5999344.

Almost surely, 2^{15996504190969} is an apocalyptic number.

15996504190969 is the 3999563-rd square number.

15996504190969 is the 1999782-nd centered octagonal number.

It is an amenable number.

15996504190969 is a deficient number, since it is larger than the sum of its proper divisors (3999564).

15996504190969 is an frugal number, since it uses more digits than its factorization.

15996504190969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7999126 (or 3999563 counting only the distinct ones).

The product of its (nonzero) digits is 212576400, while the sum is 73.

The spelling of 15996504190969 in words is "fifteen trillion, nine hundred ninety-six billion, five hundred four million, one hundred ninety thousand, nine hundred sixty-nine".