19833849845 has 4 divisors (see below), whose sum is σ = 23800619820. Its totient is φ = 15867079872.

The previous prime is 19833849823. The next prime is 19833849883. The reversal of 19833849845 is 54894833891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54894833891 = 317 ⋅173169823.

It can be written as a sum of positive squares in 2 ways, for example, as 14455974289 + 5377875556 = 120233^2 + 73334^2 .

It is a cyclic number.

It is not a de Polignac number, because 19833849845 - 2⁶ = 19833849781 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1983384980 + ... + 1983384989.

It is an arithmetic number, because the mean of its divisors is an integer number (5950154955).

Almost surely, 2^19833849845 is an apocalyptic number.

It is an amenable number.

19833849845 is a deficient number, since it is larger than the sum of its proper divisors (3966769975).

19833849845 is an equidigital number, since it uses as much as digits as its factorization.

19833849845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3966769974.

The product of its digits is 29859840, while the sum is 62.

The spelling of 19833849845 in words is "nineteen billion, eight hundred thirty-three million, eight hundred forty-nine thousand, eight hundred forty-five".