17782809453 has 6 divisors (see below), whose sum is σ = 25686280334. Its totient is φ = 11855206296.

The previous prime is 17782809449. The next prime is 17782809481. The reversal of 17782809453 is 35490828771.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12959090244 + 4823719209 = 113838^2 + 69453^2 .

It is not a de Polignac number, because 17782809453 - 2² = 17782809449 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 17782809453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17782809553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 987933850 + ... + 987933867.

Almost surely, 2^17782809453 is an apocalyptic number.

It is an amenable number.

17782809453 is a deficient number, since it is larger than the sum of its proper divisors (7903470881).

17782809453 is a wasteful number, since it uses less digits than its factorization.

17782809453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1975867723 (or 1975867720 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 17782809453 in words is "seventeen billion, seven hundred eighty-two million, eight hundred nine thousand, four hundred fifty-three".