16772774646505 has 4 divisors (see below), whose sum is σ = 20127329575812. Its totient is φ = 13418219717200.

The previous prime is 16772774646479. The next prime is 16772774646521. The reversal of 16772774646505 is 50564647727761.

It is a happy number.

16772774646505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1914116522256 + 14858658124249 = 1383516^2 + 3854693^2 .

It is not a de Polignac number, because 16772774646505 - 2¹⁷ = 16772774515433 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1677277464646 + ... + 1677277464655.

It is an arithmetic number, because the mean of its divisors is an integer number (5031832393953).

Almost surely, 2^{16772774646505} is an apocalyptic number.

It is an amenable number.

16772774646505 is a deficient number, since it is larger than the sum of its proper divisors (3354554929307).

16772774646505 is an equidigital number, since it uses as much as digits as its factorization.

16772774646505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3354554929306.

The product of its (nonzero) digits is 414892800, while the sum is 67.

The spelling of 16772774646505 in words is "sixteen trillion, seven hundred seventy-two billion, seven hundred seventy-four million, six hundred forty-six thousand, five hundred five".