18021066707 has 4 divisors (see below), whose sum is σ = 20595504816. Its totient is φ = 15446628600.

The previous prime is 18021066659. The next prime is 18021066727. The reversal of 18021066707 is 70766012081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70766012081 = 17 ⋅4162706593.

It is a cyclic number.

It is not a de Polignac number, because 18021066707 - 2⁶ = 18021066643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18021066727) 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 3 ways as a sum of consecutive naturals, for example, 1287219044 + ... + 1287219057.

It is an arithmetic number, because the mean of its divisors is an integer number (5148876204).

Almost surely, 2^18021066707 is an apocalyptic number.

18021066707 is a deficient number, since it is larger than the sum of its proper divisors (2574438109).

18021066707 is an equidigital number, since it uses as much as digits as its factorization.

18021066707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2574438108.

The product of its (nonzero) digits is 28224, while the sum is 38.

Adding to 18021066707 its reverse (70766012081), we get a palindrome (88787078788).

The spelling of 18021066707 in words is "eighteen billion, twenty-one million, sixty-six thousand, seven hundred seven".