18200168808506 has 8 divisors (see below), whose sum is σ = 27438833178900. Its totient is φ = 9053891082208.

The previous prime is 18200168808487. The next prime is 18200168808533. The reversal of 18200168808506 is 60580886100281.

It can be written as a sum of positive squares in 2 ways, for example, as 14099912350225 + 4100256458281 = 3754985^2 + 2024909^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×18200168808506² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23096660531 + ... + 23096661318.

Almost surely, 2^{18200168808506} is an apocalyptic number.

18200168808506 is a deficient number, since it is larger than the sum of its proper divisors (9238664370394).

18200168808506 is a wasteful number, since it uses less digits than its factorization.

18200168808506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46193322048.

The product of its (nonzero) digits is 1474560, while the sum is 53.

The spelling of 18200168808506 in words is "eighteen trillion, two hundred billion, one hundred sixty-eight million, eight hundred eight thousand, five hundred six".