16621823863253 has 16 divisors (see below), whose sum is σ = 19013576568960. Its totient is φ = 14234375586816.

The previous prime is 16621823863199. The next prime is 16621823863261. The reversal of 16621823863253 is 35236832812661.

It is a happy number.

16621823863253 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16621823863253 - 2²⁰ = 16621822814677 is a prime.

It is a super-3 number, since 3×16621823863253³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16621823863273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73612301 + ... + 73837757.

It is an arithmetic number, because the mean of its divisors is an integer number (1188348535560).

Almost surely, 2^{16621823863253} is an apocalyptic number.

It is an amenable number.

16621823863253 is a deficient number, since it is larger than the sum of its proper divisors (2391752705707).

16621823863253 is a wasteful number, since it uses less digits than its factorization.

16621823863253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234956.

The product of its digits is 14929920, while the sum is 56.

The spelling of 16621823863253 in words is "sixteen trillion, six hundred twenty-one billion, eight hundred twenty-three million, eight hundred sixty-three thousand, two hundred fifty-three".