16886742745 has 4 divisors (see below), whose sum is σ = 20264091300. Its totient is φ = 13509394192.

The previous prime is 16886742641. The next prime is 16886742749. The reversal of 16886742745 is 54724768861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54724768861 = 7 ⋅7817824123.

It can be written as a sum of positive squares in 2 ways, for example, as 6080724441 + 10806018304 = 77979^2 + 103952^2 .

It is a cyclic number.

It is not a de Polignac number, because 16886742745 - 2¹⁷ = 16886611673 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 16886742745.

It is not an unprimeable number, because it can be changed into a prime (16886742749) 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, 1688674270 + ... + 1688674279.

It is an arithmetic number, because the mean of its divisors is an integer number (5066022825).

Almost surely, 2^16886742745 is an apocalyptic number.

It is an amenable number.

16886742745 is a deficient number, since it is larger than the sum of its proper divisors (3377348555).

16886742745 is an equidigital number, since it uses as much as digits as its factorization.

16886742745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3377348554.

The product of its digits is 18063360, while the sum is 58.

The spelling of 16886742745 in words is "sixteen billion, eight hundred eighty-six million, seven hundred forty-two thousand, seven hundred forty-five".