18195840007 has 2 divisors, whose sum is σ = 18195840008. Its totient is φ = 18195840006.

The previous prime is 18195839951. The next prime is 18195840079. The reversal of 18195840007 is 70004859181.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18195840007 - 2¹⁵ = 18195807239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18195840097) 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, 9097920003 + 9097920004.

It is an arithmetic number, because the mean of its divisors is an integer number (9097920004).

Almost surely, 2^18195840007 is an apocalyptic number.

18195840007 is a deficient number, since it is larger than the sum of its proper divisors (1).

18195840007 is an equidigital number, since it uses as much as digits as its factorization.

18195840007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 43.

The spelling of 18195840007 in words is "eighteen billion, one hundred ninety-five million, eight hundred forty thousand, seven".