18206557065 has 48 divisors (see below), whose sum is σ = 33428133648. Its totient is φ = 9135218688.

The previous prime is 18206557063. The next prime is 18206557079. The reversal of 18206557065 is 56075560281.

18206557065 is a `hidden beast` number, since 18 + 2 + 0 + 6 + 5 + 570 + 65 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 5986581129 + 12219975936 = 77373^2 + 110544^2 .

It is not a de Polignac number, because 18206557065 - 2¹ = 18206557063 is a prime.

It is a super-3 number, since 3×18206557065³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 18206557065.

It is not an unprimeable number, because it can be changed into a prime (18206557063) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3434497 + ... + 3439793.

It is an arithmetic number, because the mean of its divisors is an integer number (696419451).

Almost surely, 2^18206557065 is an apocalyptic number.

18206557065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18206557065 is a deficient number, since it is larger than the sum of its proper divisors (15221576583).

18206557065 is a wasteful number, since it uses less digits than its factorization.

18206557065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9818 (or 9815 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 45.

The spelling of 18206557065 in words is "eighteen billion, two hundred six million, five hundred fifty-seven thousand, sixty-five".