16656081774 has 8 divisors (see below), whose sum is σ = 33312163560. Its totient is φ = 5552027256.

The previous prime is 16656081737. The next prime is 16656081779. The reversal of 16656081774 is 47718065661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

16656081774 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16656081779) 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, 1388006809 + ... + 1388006820.

It is an arithmetic number, because the mean of its divisors is an integer number (4164020445).

Almost surely, 2^16656081774 is an apocalyptic number.

16656081774 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16656081774 is a wasteful number, since it uses less digits than its factorization.

16656081774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2776013634.

The product of its (nonzero) digits is 1693440, while the sum is 51.

The spelling of 16656081774 in words is "sixteen billion, six hundred fifty-six million, eighty-one thousand, seven hundred seventy-four".