19782683785 has 4 divisors (see below), whose sum is σ = 23739220548. Its totient is φ = 15826147024.

The previous prime is 19782683783. The next prime is 19782683797. The reversal of 19782683785 is 58738628791.

It is a happy number.

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 11084510089 + 8698173696 = 105283^2 + 93264^2 .

It is a cyclic number.

It is not a de Polignac number, because 19782683785 - 2¹ = 19782683783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19782683783) 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, 1978268374 + ... + 1978268383.

It is an arithmetic number, because the mean of its divisors is an integer number (5934805137).

Almost surely, 2^19782683785 is an apocalyptic number.

It is an amenable number.

19782683785 is a deficient number, since it is larger than the sum of its proper divisors (3956536763).

19782683785 is an equidigital number, since it uses as much as digits as its factorization.

19782683785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3956536762.

The product of its digits is 40642560, while the sum is 64.

The spelling of 19782683785 in words is "nineteen billion, seven hundred eighty-two million, six hundred eighty-three thousand, seven hundred eighty-five".