16446505779 has 18 divisors (see below), whose sum is σ = 25917716916. Its totient is φ = 9966805920.

The previous prime is 16446505771. The next prime is 16446505793. The reversal of 16446505779 is 97750564461.

16446505779 is a `hidden beast` number, since 1 + 6 + 4 + 4 + 65 + 0 + 577 + 9 = 666.

16446505779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16446505779 - 2³ = 16446505771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16446505771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1269567 + ... + 1282455.

It is an arithmetic number, because the mean of its divisors is an integer number (1439873162).

Almost surely, 2^16446505779 is an apocalyptic number.

16446505779 is a deficient number, since it is larger than the sum of its proper divisors (9471211137).

16446505779 is an frugal number, since it uses more digits than its factorization.

16446505779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25795 (or 12903 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 54.

It can be divided in two parts, 16446 and 505779, that added together give a palindrome (522225).

The spelling of 16446505779 in words is "sixteen billion, four hundred forty-six million, five hundred five thousand, seven hundred seventy-nine".