16545253615421 has 8 divisors (see below), whose sum is σ = 17126221240320. Its totient is φ = 15971328022608.

The previous prime is 16545253615417. The next prime is 16545253615427. The reversal of 16545253615421 is 12451635254561.

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

It is a cyclic number.

It is not a de Polignac number, because 16545253615421 - 2² = 16545253615417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16545253615421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16545253615427) 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, 1760503241 + ... + 1760512638.

It is an arithmetic number, because the mean of its divisors is an integer number (2140777655040).

Almost surely, 2^{16545253615421} is an apocalyptic number.

It is an amenable number.

16545253615421 is a deficient number, since it is larger than the sum of its proper divisors (580967624899).

16545253615421 is a wasteful number, since it uses less digits than its factorization.

16545253615421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3521016043.

The product of its digits is 4320000, while the sum is 50.

Adding to 16545253615421 its reverse (12451635254561), we get a palindrome (28996888869982).

The spelling of 16545253615421 in words is "sixteen trillion, five hundred forty-five billion, two hundred fifty-three million, six hundred fifteen thousand, four hundred twenty-one".