18686255383 has 2 divisors, whose sum is σ = 18686255384. Its totient is φ = 18686255382.

The previous prime is 18686255321. The next prime is 18686255417. The reversal of 18686255383 is 38355268681.

It is a strong prime.

It is an emirp because it is prime and its reverse (38355268681) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18686255383 is a prime.

It is a super-2 number, since 2×18686255383² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18686255083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9343127691 + 9343127692.

It is an arithmetic number, because the mean of its divisors is an integer number (9343127692).

Almost surely, 2^18686255383 is an apocalyptic number.

18686255383 is a deficient number, since it is larger than the sum of its proper divisors (1).

18686255383 is an equidigital number, since it uses as much as digits as its factorization.

18686255383 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8294400, while the sum is 55.

The spelling of 18686255383 in words is "eighteen billion, six hundred eighty-six million, two hundred fifty-five thousand, three hundred eighty-three".