16661622127 has 4 divisors (see below), whose sum is σ = 16889863600. Its totient is φ = 16433380656.

The previous prime is 16661622077. The next prime is 16661622143. The reversal of 16661622127 is 72122616661.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16661622127 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16661622127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16661622227) 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, 114120627 + ... + 114120772.

It is an arithmetic number, because the mean of its divisors is an integer number (4222465900).

Almost surely, 2^16661622127 is an apocalyptic number.

16661622127 is a deficient number, since it is larger than the sum of its proper divisors (228241473).

16661622127 is an equidigital number, since it uses as much as digits as its factorization.

16661622127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228241472.

The product of its digits is 72576, while the sum is 40.

The spelling of 16661622127 in words is "sixteen billion, six hundred sixty-one million, six hundred twenty-two thousand, one hundred twenty-seven".