18259405663 has 6 divisors (see below), whose sum is σ = 18693920184. Its totient is φ = 17834766516.

The previous prime is 18259405651. The next prime is 18259405673. The reversal of 18259405663 is 36650495281.

It is a de Polignac number, because none of the positive numbers 2^k-18259405663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18259405603) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4935795 + ... + 4939492.

It is an arithmetic number, because the mean of its divisors is an integer number (3115653364).

Almost surely, 2^18259405663 is an apocalyptic number.

18259405663 is a deficient number, since it is larger than the sum of its proper divisors (434514521).

18259405663 is an frugal number, since it uses more digits than its factorization.

18259405663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9875373 (or 9875330 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 49.

The spelling of 18259405663 in words is "eighteen billion, two hundred fifty-nine million, four hundred five thousand, six hundred sixty-three".