18363648393 has 6 divisors (see below), whose sum is σ = 26525269914. Its totient is φ = 12242432256.

The previous prime is 18363648389. The next prime is 18363648397. The reversal of 18363648393 is 39384636381.

18363648393 is a `hidden beast` number, since 18 + 3 + 63 + 6 + 483 + 93 = 666.

It is an interprime number because it is at equal distance from previous prime (18363648389) and next prime (18363648397).

It can be written as a sum of positive squares in only one way, i.e., 9476438409 + 8887209984 = 97347^2 + 94272^2 .

It is not a de Polignac number, because 18363648393 - 2² = 18363648389 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18363648397) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1020202680 + ... + 1020202697.

It is an arithmetic number, because the mean of its divisors is an integer number (4420878319).

Almost surely, 2^18363648393 is an apocalyptic number.

It is an amenable number.

18363648393 is a deficient number, since it is larger than the sum of its proper divisors (8161621521).

18363648393 is a wasteful number, since it uses less digits than its factorization.

18363648393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040405383 (or 2040405380 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 54.

The spelling of 18363648393 in words is "eighteen billion, three hundred sixty-three million, six hundred forty-eight thousand, three hundred ninety-three".