18668640868207 has 8 divisors (see below), whose sum is σ = 20534102353872. Its totient is φ = 16971491697160.

The previous prime is 18668640868193. The next prime is 18668640868219. The reversal of 18668640868207 is 70286804686681.

It is not a de Polignac number, because 18668640868207 - 2⁷ = 18668640868079 is a prime.

It is a super-2 number, since 2×18668640868207² (a number of 27 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 (18668640868607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7013011768 + ... + 7013014429.

It is an arithmetic number, because the mean of its divisors is an integer number (2566762794234).

Almost surely, 2^{18668640868207} is an apocalyptic number.

18668640868207 is a deficient number, since it is larger than the sum of its proper divisors (1865461485665).

18668640868207 is an equidigital number, since it uses as much as digits as its factorization.

18668640868207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14026026230 (or 14026026208 counting only the distinct ones).

The product of its (nonzero) digits is 297271296, while the sum is 70.

The spelling of 18668640868207 in words is "eighteen trillion, six hundred sixty-eight billion, six hundred forty million, eight hundred sixty-eight thousand, two hundred seven".