18284578457 has 4 divisors (see below), whose sum is σ = 18386727120. Its totient is φ = 18182429796.

The previous prime is 18284578451. The next prime is 18284578513. The reversal of 18284578457 is 75487548281.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75487548281 = 180221 ⋅418861.

It is a cyclic number.

It is not a de Polignac number, because 18284578457 - 2⁶ = 18284578393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18284578396 and 18284578405.

It is not an unprimeable number, because it can be changed into a prime (18284578451) 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, 51074063 + ... + 51074420.

It is an arithmetic number, because the mean of its divisors is an integer number (4596681780).

Almost surely, 2^18284578457 is an apocalyptic number.

It is an amenable number.

18284578457 is a deficient number, since it is larger than the sum of its proper divisors (102148663).

18284578457 is a wasteful number, since it uses less digits than its factorization.

18284578457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102148662.

The product of its digits is 20070400, while the sum is 59.

The spelling of 18284578457 in words is "eighteen billion, two hundred eighty-four million, five hundred seventy-eight thousand, four hundred fifty-seven".