18520033668369 has 4 divisors (see below), whose sum is σ = 24693378224496. Its totient is φ = 12346689112244.

The previous prime is 18520033668317. The next prime is 18520033668397. The reversal of 18520033668369 is 96386633002581.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18520033668369 is a prime.

It is a super-2 number, since 2×18520033668369² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18520033668469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3086672278059 + ... + 3086672278064.

It is an arithmetic number, because the mean of its divisors is an integer number (6173344556124).

Almost surely, 2^{18520033668369} is an apocalyptic number.

It is an amenable number.

18520033668369 is a deficient number, since it is larger than the sum of its proper divisors (6173344556127).

18520033668369 is an equidigital number, since it uses as much as digits as its factorization.

18520033668369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6173344556126.

The product of its (nonzero) digits is 33592320, while the sum is 60.

The spelling of 18520033668369 in words is "eighteen trillion, five hundred twenty billion, thirty-three million, six hundred sixty-eight thousand, three hundred sixty-nine".