18195807247 has 2 divisors, whose sum is σ = 18195807248. Its totient is φ = 18195807246.

The previous prime is 18195807239. The next prime is 18195807263. The reversal of 18195807247 is 74270859181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18195807247 - 2³ = 18195807239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18195807194 and 18195807203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18195807947) 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, 9097903623 + 9097903624.

It is an arithmetic number, because the mean of its divisors is an integer number (9097903624).

Almost surely, 2^18195807247 is an apocalyptic number.

18195807247 is a deficient number, since it is larger than the sum of its proper divisors (1).

18195807247 is an equidigital number, since it uses as much as digits as its factorization.

18195807247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1128960, while the sum is 52.

The spelling of 18195807247 in words is "eighteen billion, one hundred ninety-five million, eight hundred seven thousand, two hundred forty-seven".