16545720216394 has 4 divisors (see below), whose sum is σ = 24818580324594. Its totient is φ = 8272860108196.

The previous prime is 16545720216391. The next prime is 16545720216439. The reversal of 16545720216394 is 49361202754561.

16545720216394 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.

It can be written as a sum of positive squares in only one way, i.e., 10188832080025 + 6356888136369 = 3191995^2 + 2521287^2 .

It is a super-2 number, since 2×16545720216394² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16545720216391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4136430054097 + ... + 4136430054100.

Almost surely, 2^{16545720216394} is an apocalyptic number.

16545720216394 is a deficient number, since it is larger than the sum of its proper divisors (8272860108200).

16545720216394 is an equidigital number, since it uses as much as digits as its factorization.

16545720216394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8272860108199.

The product of its (nonzero) digits is 10886400, while the sum is 55.

The spelling of 16545720216394 in words is "sixteen trillion, five hundred forty-five billion, seven hundred twenty million, two hundred sixteen thousand, three hundred ninety-four".