16785780053666 has 8 divisors (see below), whose sum is σ = 27115490855964. Its totient is φ = 7747283101680.

The previous prime is 16785780053663. The next prime is 16785780053687. The reversal of 16785780053666 is 66635008758761.

16785780053666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 16250291257225 + 535488796441 = 4031165^2 + 731771^2 .

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16785780053596 and 16785780053605.

It is not an unprimeable number, because it can be changed into a prime (16785780053663) 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, 322803462545 + ... + 322803462596.

Almost surely, 2^{16785780053666} is an apocalyptic number.

16785780053666 is a deficient number, since it is larger than the sum of its proper divisors (10329710802298).

16785780053666 is a wasteful number, since it uses less digits than its factorization.

16785780053666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645606925156.

The product of its (nonzero) digits is 304819200, while the sum is 68.

The spelling of 16785780053666 in words is "sixteen trillion, seven hundred eighty-five billion, seven hundred eighty million, fifty-three thousand, six hundred sixty-six".