18123509351 has 2 divisors, whose sum is σ = 18123509352. Its totient is φ = 18123509350.

The previous prime is 18123509317. The next prime is 18123509377. The reversal of 18123509351 is 15390532181.

It is a strong prime.

It is an emirp because it is prime and its reverse (15390532181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18123509351 - 2²² = 18119315047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18123539351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9061754675 + 9061754676.

It is an arithmetic number, because the mean of its divisors is an integer number (9061754676).

Almost surely, 2^18123509351 is an apocalyptic number.

18123509351 is a deficient number, since it is larger than the sum of its proper divisors (1).

18123509351 is an equidigital number, since it uses as much as digits as its factorization.

18123509351 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 18123509351 in words is "eighteen billion, one hundred twenty-three million, five hundred nine thousand, three hundred fifty-one".