19835661388 has 6 divisors (see below), whose sum is σ = 34712407436. Its totient is φ = 9917830692.

The previous prime is 19835661371. The next prime is 19835661389. The reversal of 19835661388 is 88316653891.

It is not an unprimeable number, because it can be changed into a prime (19835661389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2479457670 + ... + 2479457677.

Almost surely, 2^19835661388 is an apocalyptic number.

It is an amenable number.

19835661388 is a deficient number, since it is larger than the sum of its proper divisors (14876746048).

19835661388 is a wasteful number, since it uses less digits than its factorization.

19835661388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4958915351 (or 4958915349 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 58.

The spelling of 19835661388 in words is "nineteen billion, eight hundred thirty-five million, six hundred sixty-one thousand, three hundred eighty-eight".