18783863257 has 4 divisors (see below), whose sum is σ = 18796038400. Its totient is φ = 18771688116.

The previous prime is 18783863251. The next prime is 18783863291. The reversal of 18783863257 is 75236838781.

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 18783863257 - 2¹¹ = 18783861209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18783863251) 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, 6085257 + ... + 6088342.

It is an arithmetic number, because the mean of its divisors is an integer number (4699009600).

Almost surely, 2^18783863257 is an apocalyptic number.

It is an amenable number.

18783863257 is a deficient number, since it is larger than the sum of its proper divisors (12175143).

18783863257 is a wasteful number, since it uses less digits than its factorization.

18783863257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12175142.

The product of its digits is 13547520, while the sum is 58.

The spelling of 18783863257 in words is "eighteen billion, seven hundred eighty-three million, eight hundred sixty-three thousand, two hundred fifty-seven".