18855897785 has 8 divisors (see below), whose sum is σ = 22725886920. Its totient is φ = 15018845184.

The previous prime is 18855897763. The next prime is 18855897791. The reversal of 18855897785 is 58779855881.

It can be written as a sum of positive squares in 4 ways, for example, as 7675161664 + 11180736121 = 87608^2 + 105739^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18855897785 - 2⁶ = 18855897721 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8232872 + ... + 8235161.

It is an arithmetic number, because the mean of its divisors is an integer number (2840735865).

Almost surely, 2^18855897785 is an apocalyptic number.

It is an amenable number.

18855897785 is a deficient number, since it is larger than the sum of its proper divisors (3869989135).

18855897785 is a wasteful number, since it uses less digits than its factorization.

18855897785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16468267.

The product of its digits is 225792000, while the sum is 71.

The spelling of 18855897785 in words is "eighteen billion, eight hundred fifty-five million, eight hundred ninety-seven thousand, seven hundred eighty-five".