18148536391 has 2 divisors, whose sum is σ = 18148536392. Its totient is φ = 18148536390.

The previous prime is 18148536319. The next prime is 18148536401. The reversal of 18148536391 is 19363584181.

Together with previous prime (18148536319) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18148536391 - 2¹³ = 18148528199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18148546391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9074268195 + 9074268196.

It is an arithmetic number, because the mean of its divisors is an integer number (9074268196).

Almost surely, 2^18148536391 is an apocalyptic number.

18148536391 is a deficient number, since it is larger than the sum of its proper divisors (1).

18148536391 is an equidigital number, since it uses as much as digits as its factorization.

18148536391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 49.

The spelling of 18148536391 in words is "eighteen billion, one hundred forty-eight million, five hundred thirty-six thousand, three hundred ninety-one".