16611993127 has 4 divisors (see below), whose sum is σ = 16615673680. Its totient is φ = 16608312576.

The previous prime is 16611993089. The next prime is 16611993131. The reversal of 16611993127 is 72139911661.

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 16611993127 - 2¹¹ = 16611991079 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 (16611993137) 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, 1833498 + ... + 1842535.

It is an arithmetic number, because the mean of its divisors is an integer number (4153918420).

Almost surely, 2^16611993127 is an apocalyptic number.

16611993127 is a deficient number, since it is larger than the sum of its proper divisors (3680553).

16611993127 is an equidigital number, since it uses as much as digits as its factorization.

16611993127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3680552.

The product of its digits is 122472, while the sum is 46.

The spelling of 16611993127 in words is "sixteen billion, six hundred eleven million, nine hundred ninety-three thousand, one hundred twenty-seven".