18864863519 has 2 divisors, whose sum is σ = 18864863520. Its totient is φ = 18864863518.

The previous prime is 18864863503. The next prime is 18864863533. The reversal of 18864863519 is 91536846881.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (91536846881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18864863519 - 2⁴ = 18864863503 is a prime.

It is a super-2 number, since 2×18864863519² (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 (18864863119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9432431759 + 9432431760.

It is an arithmetic number, because the mean of its divisors is an integer number (9432431760).

Almost surely, 2^18864863519 is an apocalyptic number.

18864863519 is a deficient number, since it is larger than the sum of its proper divisors (1).

18864863519 is an equidigital number, since it uses as much as digits as its factorization.

18864863519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9953280, while the sum is 59.

The spelling of 18864863519 in words is "eighteen billion, eight hundred sixty-four million, eight hundred sixty-three thousand, five hundred nineteen".