19965831255 has 12 divisors (see below), whose sum is σ = 34607440920. Its totient is φ = 10648443312.

The previous prime is 19965831247. The next prime is 19965831299. The reversal of 19965831255 is 55213856991.

19965831255 is a `hidden beast` number, since 1 + 9 + 9 + 6 + 583 + 1 + 2 + 55 = 666.

It is not a de Polignac number, because 19965831255 - 2³ = 19965831247 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

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, 221842525 + ... + 221842614.

It is an arithmetic number, because the mean of its divisors is an integer number (2883953410).

Almost surely, 2^19965831255 is an apocalyptic number.

19965831255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19965831255 is a deficient number, since it is larger than the sum of its proper divisors (14641609665).

19965831255 is a wasteful number, since it uses less digits than its factorization.

19965831255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443685150 (or 443685147 counting only the distinct ones).

The product of its digits is 2916000, while the sum is 54.

The spelling of 19965831255 in words is "nineteen billion, nine hundred sixty-five million, eight hundred thirty-one thousand, two hundred fifty-five".