16089947521 has 4 divisors (see below), whose sum is σ = 16182953172. Its totient is φ = 15996941872.

The previous prime is 16089947507. The next prime is 16089947527. The reversal of 16089947521 is 12574998061.

16089947521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12574998061 = 27011 ⋅465551.

It can be written as a sum of positive squares in 2 ways, for example, as 13928720400 + 2161227121 = 118020^2 + 46489^2 .

It is a cyclic number.

It is not a de Polignac number, because 16089947521 - 2¹³ = 16089939329 is a prime.

It is a super-2 number, since 2×16089947521² (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 (16089947527) 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 3 ways as a sum of consecutive naturals, for example, 46502566 + ... + 46502911.

It is an arithmetic number, because the mean of its divisors is an integer number (4045738293).

Almost surely, 2^16089947521 is an apocalyptic number.

It is an amenable number.

16089947521 is a deficient number, since it is larger than the sum of its proper divisors (93005651).

16089947521 is an equidigital number, since it uses as much as digits as its factorization.

16089947521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93005650.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 16089947521 in words is "sixteen billion, eighty-nine million, nine hundred forty-seven thousand, five hundred twenty-one".