18534647387 has 2 divisors, whose sum is σ = 18534647388. Its totient is φ = 18534647386.

The previous prime is 18534647371. The next prime is 18534647401. The reversal of 18534647387 is 78374643581.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18534647387 - 2⁴ = 18534647371 is a prime.

It is not a weakly prime, because it can be changed into another prime (18534647347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9267323693 + 9267323694.

It is an arithmetic number, because the mean of its divisors is an integer number (9267323694).

Almost surely, 2^18534647387 is an apocalyptic number.

18534647387 is a deficient number, since it is larger than the sum of its proper divisors (1).

18534647387 is an equidigital number, since it uses as much as digits as its factorization.

18534647387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13547520, while the sum is 56.

The spelling of 18534647387 in words is "eighteen billion, five hundred thirty-four million, six hundred forty-seven thousand, three hundred eighty-seven".