18515036366863 has 2 divisors, whose sum is σ = 18515036366864. Its totient is φ = 18515036366862.

The previous prime is 18515036366833. The next prime is 18515036366873. The reversal of 18515036366863 is 36866363051581.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18515036366863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18515036366803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9257518183431 + 9257518183432.

It is an arithmetic number, because the mean of its divisors is an integer number (9257518183432).

Almost surely, 2^{18515036366863} is an apocalyptic number.

18515036366863 is a deficient number, since it is larger than the sum of its proper divisors (1).

18515036366863 is an equidigital number, since it uses as much as digits as its factorization.

18515036366863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55987200, while the sum is 61.

The spelling of 18515036366863 in words is "eighteen trillion, five hundred fifteen billion, thirty-six million, three hundred sixty-six thousand, eight hundred sixty-three".