18536663361 has 8 divisors (see below), whose sum is σ = 24717146944. Its totient is φ = 12356977680.

The previous prime is 18536663351. The next prime is 18536663363. The reversal of 18536663361 is 16336663581.

It is a happy number.

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

It is not a de Polignac number, because 18536663361 - 2¹¹ = 18536661313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18536663361.

It is not an unprimeable number, because it can be changed into a prime (18536663363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142981 + ... + 239826.

It is an arithmetic number, because the mean of its divisors is an integer number (3089643368).

Almost surely, 2^18536663361 is an apocalyptic number.

It is an amenable number.

18536663361 is a deficient number, since it is larger than the sum of its proper divisors (6180483583).

18536663361 is a wasteful number, since it uses less digits than its factorization.

18536663361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398951.

The product of its digits is 1399680, while the sum is 48.

The spelling of 18536663361 in words is "eighteen billion, five hundred thirty-six million, six hundred sixty-three thousand, three hundred sixty-one".