18665490807 has 24 divisors (see below), whose sum is σ = 28386924800. Its totient is φ = 11785970448.

The previous prime is 18665490797. The next prime is 18665490839. The reversal of 18665490807 is 70809456681.

18665490807 is a `hidden beast` number, since 18 + 6 + 6 + 549 + 0 + 80 + 7 = 666.

It is not a de Polignac number, because 18665490807 - 2⁴ = 18665490791 is a prime.

It is a super-2 number, since 2×18665490807² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18665491807) 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 in 23 ways as a sum of consecutive naturals, for example, 916578 + ... + 936720.

Almost surely, 2^18665490807 is an apocalyptic number.

18665490807 is a deficient number, since it is larger than the sum of its proper divisors (9721433993).

18665490807 is a wasteful number, since it uses less digits than its factorization.

18665490807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25587 (or 25584 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 18665490807 in words is "eighteen billion, six hundred sixty-five million, four hundred ninety thousand, eight hundred seven".