19693643782 has 16 divisors (see below), whose sum is σ = 29744872704. Its totient is φ = 9778725000.

The previous prime is 19693643771. The next prime is 19693643789. The reversal of 19693643782 is 28734639691.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19693643789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1318657 + ... + 1333507.

It is an arithmetic number, because the mean of its divisors is an integer number (1859054544).

Almost surely, 2^19693643782 is an apocalyptic number.

19693643782 is a deficient number, since it is larger than the sum of its proper divisors (10051228922).

19693643782 is a wasteful number, since it uses less digits than its factorization.

19693643782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19395.

The product of its digits is 11757312, while the sum is 58.

The spelling of 19693643782 in words is "nineteen billion, six hundred ninety-three million, six hundred forty-three thousand, seven hundred eighty-two".