10181818201 has 4 divisors (see below), whose sum is σ = 10192240692. Its totient is φ = 10171395712.

The previous prime is 10181818187. The next prime is 10181818223. The reversal of 10181818201 is 10281818101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9470209225 + 711608976 = 97315^2 + 26676^2 .

It is a cyclic number.

It is not a de Polignac number, because 10181818201 - 2⁵ = 10181818169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10181818291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5209780 + ... + 5211733.

It is an arithmetic number, because the mean of its divisors is an integer number (2548060173).

Almost surely, 2^10181818201 is an apocalyptic number.

It is an amenable number.

10181818201 is a deficient number, since it is larger than the sum of its proper divisors (10422491).

10181818201 is an equidigital number, since it uses as much as digits as its factorization.

10181818201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10422490.

The product of its (nonzero) digits is 1024, while the sum is 31.

The spelling of 10181818201 in words is "ten billion, one hundred eighty-one million, eight hundred eighteen thousand, two hundred one".