16221588496 has 45 divisors (see below), whose sum is σ = 33404698551. Its totient is φ = 7629613056.

The previous prime is 16221588491. The next prime is 16221588503. The reversal of 16221588496 is 69488512261.

The square root of 16221588496 is 127364.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1667578896 + 14554009600 = 40836^2 + 120640^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16221588491) 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, 8659816 + ... + 8661688.

Almost surely, 2^16221588496 is an apocalyptic number.

16221588496 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

16221588496 is the 127364-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16221588496

16221588496 is an abundant number, since it is smaller than the sum of its proper divisors (17183110055).

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

16221588496 is an frugal number, since it uses more digits than its factorization.

16221588496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3788 (or 1892 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 52.

The spelling of 16221588496 in words is "sixteen billion, two hundred twenty-one million, five hundred eighty-eight thousand, four hundred ninety-six".