16545720216399 has 8 divisors (see below), whose sum is σ = 24066502132992. Its totient is φ = 10027709222040.

The previous prime is 16545720216391. The next prime is 16545720216439. The reversal of 16545720216399 is 99361202754561.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16545720216399 - 2³ = 16545720216391 is a prime.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 250692730519 + ... + 250692730584.

It is an arithmetic number, because the mean of its divisors is an integer number (3008312766624).

Almost surely, 2^{16545720216399} is an apocalyptic number.

16545720216399 is a deficient number, since it is larger than the sum of its proper divisors (7520781916593).

16545720216399 is a wasteful number, since it uses less digits than its factorization.

16545720216399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501385461117.

The product of its (nonzero) digits is 24494400, while the sum is 60.

The spelling of 16545720216399 in words is "sixteen trillion, five hundred forty-five billion, seven hundred twenty million, two hundred sixteen thousand, three hundred ninety-nine".