18466633391 has 2 divisors, whose sum is σ = 18466633392. Its totient is φ = 18466633390.

The previous prime is 18466633379. The next prime is 18466633439. The reversal of 18466633391 is 19333666481.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18466633391 - 2¹⁴ = 18466617007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18466633301) 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, 9233316695 + 9233316696.

It is an arithmetic number, because the mean of its divisors is an integer number (9233316696).

Almost surely, 2^18466633391 is an apocalyptic number.

18466633391 is a deficient number, since it is larger than the sum of its proper divisors (1).

18466633391 is an equidigital number, since it uses as much as digits as its factorization.

18466633391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 50.

The spelling of 18466633391 in words is "eighteen billion, four hundred sixty-six million, six hundred thirty-three thousand, three hundred ninety-one".