18705575971 has 4 divisors (see below), whose sum is σ = 18840148600. Its totient is φ = 18571003344.

The previous prime is 18705575947. The next prime is 18705576031. The reversal of 18705575971 is 17957550781.

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 18705575971 - 2⁵ = 18705575939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18705570971) 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, 67286106 + ... + 67286383.

It is an arithmetic number, because the mean of its divisors is an integer number (4710037150).

Almost surely, 2^18705575971 is an apocalyptic number.

18705575971 is a deficient number, since it is larger than the sum of its proper divisors (134572629).

18705575971 is a wasteful number, since it uses less digits than its factorization.

18705575971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134572628.

The product of its (nonzero) digits is 3087000, while the sum is 55.

The spelling of 18705575971 in words is "eighteen billion, seven hundred five million, five hundred seventy-five thousand, nine hundred seventy-one".