16228538661893 has 4 divisors (see below), whose sum is σ = 16228782396588. Its totient is φ = 16228294927200.

The previous prime is 16228538661887. The next prime is 16228538661917. The reversal of 16228538661893 is 39816683582261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14824486666564 + 1404051995329 = 3850258^2 + 1184927^2 .

It is a cyclic number.

It is not a de Polignac number, because 16228538661893 - 2⁸ = 16228538661637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16228538667893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121767446 + ... + 121900647.

It is an arithmetic number, because the mean of its divisors is an integer number (4057195599147).

Almost surely, 2^{16228538661893} is an apocalyptic number.

It is an amenable number.

16228538661893 is a deficient number, since it is larger than the sum of its proper divisors (243734695).

16228538661893 is an equidigital number, since it uses as much as digits as its factorization.

16228538661893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243734694.

The product of its digits is 179159040, while the sum is 68.

The spelling of 16228538661893 in words is "sixteen trillion, two hundred twenty-eight billion, five hundred thirty-eight million, six hundred sixty-one thousand, eight hundred ninety-three".