18368486381 has 12 divisors (see below), whose sum is σ = 21371771520. Its totient is φ = 15741212760.

The previous prime is 18368486369. The next prime is 18368486387.

18368486381 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-18368486381 is a prime.

It is a super-2 number, since 2×18368486381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18368486387) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 223166 + ... + 294176.

It is an arithmetic number, because the mean of its divisors is an integer number (1780980960).

Almost surely, 2^18368486381 is an apocalyptic number.

It is an amenable number.

18368486381 is a deficient number, since it is larger than the sum of its proper divisors (3003285139).

18368486381 is an equidigital number, since it uses as much as digits as its factorization.

18368486381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76304 (or 76297 counting only the distinct ones).

The product of its digits is 5308416, while the sum is 56.

The spelling of 18368486381 in words is "eighteen billion, three hundred sixty-eight million, four hundred eighty-six thousand, three hundred eighty-one".