16658242791 has 4 divisors (see below), whose sum is σ = 22210990392. Its totient is φ = 11105495192.

The previous prime is 16658242787. The next prime is 16658242793. The reversal of 16658242791 is 19724285661.

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 16658242791 - 2² = 16658242787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16658242793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2776373796 + ... + 2776373801.

It is an arithmetic number, because the mean of its divisors is an integer number (5552747598).

Almost surely, 2^16658242791 is an apocalyptic number.

16658242791 is a deficient number, since it is larger than the sum of its proper divisors (5552747601).

16658242791 is an equidigital number, since it uses as much as digits as its factorization.

16658242791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5552747600.

The product of its digits is 1451520, while the sum is 51.

The spelling of 16658242791 in words is "sixteen billion, six hundred fifty-eight million, two hundred forty-two thousand, seven hundred ninety-one".