16620643199 has 4 divisors (see below), whose sum is σ = 16621609440. Its totient is φ = 16619676960.

The previous prime is 16620643177. The next prime is 16620643217. The reversal of 16620643199 is 99134602661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16620643199 - 2¹² = 16620639103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16620643799) 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, 456842 + ... + 491879.

It is an arithmetic number, because the mean of its divisors is an integer number (4155402360).

Almost surely, 2^16620643199 is an apocalyptic number.

16620643199 is a deficient number, since it is larger than the sum of its proper divisors (966241).

16620643199 is an equidigital number, since it uses as much as digits as its factorization.

16620643199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966240.

The product of its (nonzero) digits is 419904, while the sum is 47.

The spelling of 16620643199 in words is "sixteen billion, six hundred twenty million, six hundred forty-three thousand, one hundred ninety-nine".