16545720216401 has 4 divisors (see below), whose sum is σ = 16546200686400. Its totient is φ = 16545239746404.

The previous prime is 16545720216391. The next prime is 16545720216439. The reversal of 16545720216401 is 10461202754561.

16545720216401 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16545720216401 - 2²² = 16545716022097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16545720210401) 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, 240183341 + ... + 240252218.

It is an arithmetic number, because the mean of its divisors is an integer number (4136550171600).

Almost surely, 2^{16545720216401} is an apocalyptic number.

It is an amenable number.

16545720216401 is a deficient number, since it is larger than the sum of its proper divisors (480469999).

16545720216401 is an equidigital number, since it uses as much as digits as its factorization.

16545720216401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480469998.

The product of its (nonzero) digits is 403200, while the sum is 44.

The spelling of 16545720216401 in words is "sixteen trillion, five hundred forty-five billion, seven hundred twenty million, two hundred sixteen thousand, four hundred one".