15972662689 has 9 divisors (see below), whose sum is σ = 16325808627. Its totient is φ = 15627005184.

The previous prime is 15972662687. The next prime is 15972662701. The reversal of 15972662689 is 98626627951.

The square root of 15972662689 is 126383.

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

It can be written as a sum of positive squares in only one way, i.e., 576816289 + 15395846400 = 24017^2 + 124080^2 .

It is not a de Polignac number, because 15972662689 - 2¹ = 15972662687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15972662687) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5938657 + ... + 5941345.

Almost surely, 2^15972662689 is an apocalyptic number.

15972662689 is the 126383-rd square number.

15972662689 is the 63192-nd centered octagonal number.

It is an amenable number.

15972662689 is a deficient number, since it is larger than the sum of its proper divisors (353145938).

15972662689 is an frugal number, since it uses more digits than its factorization.

15972662689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5472 (or 2736 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 61.

The spelling of 15972662689 in words is "fifteen billion, nine hundred seventy-two million, six hundred sixty-two thousand, six hundred eighty-nine".