16394168621 has 4 divisors (see below), whose sum is σ = 16394497152. Its totient is φ = 16393840092.

The previous prime is 16394168617. The next prime is 16394168627. The reversal of 16394168621 is 12686149361.

16394168621 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 16394168621 - 2² = 16394168617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16394168627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72221 + ... + 194946.

It is an arithmetic number, because the mean of its divisors is an integer number (4098624288).

Almost surely, 2^16394168621 is an apocalyptic number.

It is an amenable number.

16394168621 is a deficient number, since it is larger than the sum of its proper divisors (328531).

16394168621 is an equidigital number, since it uses as much as digits as its factorization.

16394168621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328530.

The product of its digits is 373248, while the sum is 47.

The spelling of 16394168621 in words is "sixteen billion, three hundred ninety-four million, one hundred sixty-eight thousand, six hundred twenty-one".