19835219845 has 12 divisors (see below), whose sum is σ = 27688348044. Its totient is φ = 13601293440.

The previous prime is 19835219837. The next prime is 19835219857. The reversal of 19835219845 is 54891253891.

It can be written as a sum of positive squares in 2 ways, for example, as 7294355649 + 12540864196 = 85407^2 + 111986^2 .

It is not a de Polignac number, because 19835219845 - 2³ = 19835219837 is a prime.

It is a super-3 number, since 3×19835219845³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40479796 + ... + 40480285.

It is an arithmetic number, because the mean of its divisors is an integer number (2307362337).

Almost surely, 2^19835219845 is an apocalyptic number.

It is an amenable number.

19835219845 is a deficient number, since it is larger than the sum of its proper divisors (7853128199).

19835219845 is an equidigital number, since it uses as much as digits as its factorization.

19835219845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80960100 (or 80960093 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 55.

The spelling of 19835219845 in words is "nineteen billion, eight hundred thirty-five million, two hundred nineteen thousand, eight hundred forty-five".