19834087681 has 4 divisors (see below), whose sum is σ = 19937931264. Its totient is φ = 19730244100.

The previous prime is 19834087639. The next prime is 19834087687. The reversal of 19834087681 is 18678043891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19834087681 - 2²³ = 19825699073 is a prime.

It is a super-2 number, since 2×19834087681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19834087687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51921505 + ... + 51921886.

It is an arithmetic number, because the mean of its divisors is an integer number (4984482816).

Almost surely, 2^19834087681 is an apocalyptic number.

It is an amenable number.

19834087681 is a deficient number, since it is larger than the sum of its proper divisors (103843583).

19834087681 is a wasteful number, since it uses less digits than its factorization.

19834087681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103843582.

The product of its (nonzero) digits is 2322432, while the sum is 55.

The spelling of 19834087681 in words is "nineteen billion, eight hundred thirty-four million, eighty-seven thousand, six hundred eighty-one".