19953883871 has 4 divisors (see below), whose sum is σ = 20159594112. Its totient is φ = 19748173632.

The previous prime is 19953883867. The next prime is 19953883877. The reversal of 19953883871 is 17838835991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19953883871 - 2² = 19953883867 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19953883877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102854975 + ... + 102855168.

It is an arithmetic number, because the mean of its divisors is an integer number (5039898528).

Almost surely, 2^19953883871 is an apocalyptic number.

19953883871 is a deficient number, since it is larger than the sum of its proper divisors (205710241).

19953883871 is an equidigital number, since it uses as much as digits as its factorization.

19953883871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205710240.

The product of its digits is 13063680, while the sum is 62.

The spelling of 19953883871 in words is "nineteen billion, nine hundred fifty-three million, eight hundred eighty-three thousand, eight hundred seventy-one".