16158731689 has 9 divisors (see below), whose sum is σ = 16250390821. Its totient is φ = 16067588800.

The previous prime is 16158731683. The next prime is 16158731717. The reversal of 16158731689 is 98613785161.

It is a happy number.

The square root of 16158731689 is 127117.

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

16158731689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 309936025 + 15848795664 = 17605^2 + 125892^2 .

It is not a de Polignac number, because 16158731689 - 2³ = 16158731681 is a prime.

It is a super-2 number, since 2×16158731689² (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 (16158731681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 40295889 + ... + 40296289.

Almost surely, 2^16158731689 is an apocalyptic number.

16158731689 is the 127117-th square number.

16158731689 is the 63559-th centered octagonal number.

It is an amenable number.

16158731689 is a deficient number, since it is larger than the sum of its proper divisors (91659132).

16158731689 is an frugal number, since it uses more digits than its factorization.

16158731689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436 (or 718 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 55.

The spelling of 16158731689 in words is "sixteen billion, one hundred fifty-eight million, seven hundred thirty-one thousand, six hundred eighty-nine".