18645786827 has 2 divisors, whose sum is σ = 18645786828. Its totient is φ = 18645786826.

The previous prime is 18645786823. The next prime is 18645786829. The reversal of 18645786827 is 72868754681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18645786827 - 2² = 18645786823 is a prime.

Together with 18645786829, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18645786827.

It is not a weakly prime, because it can be changed into another prime (18645786821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9322893413 + 9322893414.

It is an arithmetic number, because the mean of its divisors is an integer number (9322893414).

Almost surely, 2^18645786827 is an apocalyptic number.

18645786827 is a deficient number, since it is larger than the sum of its proper divisors (1).

18645786827 is an equidigital number, since it uses as much as digits as its factorization.

18645786827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36126720, while the sum is 62.

The spelling of 18645786827 in words is "eighteen billion, six hundred forty-five million, seven hundred eighty-six thousand, eight hundred twenty-seven".