16191544516 has 81 divisors (see below), whose sum is σ = 33736979367. Its totient is φ = 6779666880.

The previous prime is 16191544513. The next prime is 16191544517. The reversal of 16191544516 is 61544519161.

It is a happy number.

The square root of 16191544516 is 127246.

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

16191544516 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 12044184516 + 4147360000 = 109746^2 + 64400^2 .

It is a super-2 number, since 2×16191544516² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16191544511) 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 26 ways as a sum of consecutive naturals, for example, 108668010 + ... + 108668158.

Almost surely, 2^16191544516 is an apocalyptic number.

16191544516 is the 127246-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16191544516

16191544516 is an abundant number, since it is smaller than the sum of its proper divisors (17545434851).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16191544516 is an equidigital number, since it uses as much as digits as its factorization.

16191544516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438 (or 219 counting only the distinct ones).

The product of its digits is 129600, while the sum is 43.

The spelling of 16191544516 in words is "sixteen billion, one hundred ninety-one million, five hundred forty-four thousand, five hundred sixteen".