15720896689 has 3 divisors (see below), whose sum is σ = 15721022073. Its totient is φ = 15720771306.

The previous prime is 15720896651. The next prime is 15720896701. The reversal of 15720896689 is 98669802751.

The square root of 15720896689 is 125383.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98669802751 = 13 ⋅7589984827.

It is not a de Polignac number, because 15720896689 - 2¹¹ = 15720894641 is a prime.

It is a super-2 number, since 2×15720896689² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15720896089) 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, 62692 + ... + 188074.

It is an arithmetic number, because the mean of its divisors is an integer number (5240340691).

Almost surely, 2^15720896689 is an apocalyptic number.

15720896689 is the 125383-rd square number.

15720896689 is the 62692-nd centered octagonal number.

It is an amenable number.

15720896689 is a deficient number, since it is larger than the sum of its proper divisors (125384).

15720896689 is an frugal number, since it uses more digits than its factorization.

15720896689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250766 (or 125383 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 61.

The spelling of 15720896689 in words is "fifteen billion, seven hundred twenty million, eight hundred ninety-six thousand, six hundred eighty-nine".