18217820065 has 64 divisors (see below), whose sum is σ = 24290426880. Its totient is φ = 13063680000.

The previous prime is 18217820063. The next prime is 18217820119. The reversal of 18217820065 is 56002871281.

It is not a de Polignac number, because 18217820065 - 2¹ = 18217820063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18217820063) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 31573057 + ... + 31573633.

It is an arithmetic number, because the mean of its divisors is an integer number (379537920).

Almost surely, 2^18217820065 is an apocalyptic number.

It is an amenable number.

18217820065 is a deficient number, since it is larger than the sum of its proper divisors (6072606815).

18217820065 is a wasteful number, since it uses less digits than its factorization.

18217820065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854.

The product of its (nonzero) digits is 53760, while the sum is 40.

The spelling of 18217820065 in words is "eighteen billion, two hundred seventeen million, eight hundred twenty thousand, sixty-five".