16318739391 has 4 divisors (see below), whose sum is σ = 21758319192. Its totient is φ = 10879159592.

The previous prime is 16318739363. The next prime is 16318739401. The reversal of 16318739391 is 19393781361.

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 16318739391 - 2⁹ = 16318738879 is a prime.

It is a super-2 number, since 2×16318739391² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16318739491) 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, 2719789896 + ... + 2719789901.

It is an arithmetic number, because the mean of its divisors is an integer number (5439579798).

Almost surely, 2^16318739391 is an apocalyptic number.

16318739391 is a deficient number, since it is larger than the sum of its proper divisors (5439579801).

16318739391 is an equidigital number, since it uses as much as digits as its factorization.

16318739391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5439579800.

The product of its digits is 734832, while the sum is 51.

The spelling of 16318739391 in words is "sixteen billion, three hundred eighteen million, seven hundred thirty-nine thousand, three hundred ninety-one".