18266202685 has 4 divisors (see below), whose sum is σ = 21919443228. Its totient is φ = 14612962144.

The previous prime is 18266202683. The next prime is 18266202727. The reversal of 18266202685 is 58620266281.

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 13027483044 + 5238719641 = 114138^2 + 72379^2 .

It is a cyclic number.

It is not a de Polignac number, because 18266202685 - 2¹ = 18266202683 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18266202683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1826620264 + ... + 1826620273.

It is an arithmetic number, because the mean of its divisors is an integer number (5479860807).

Almost surely, 2^18266202685 is an apocalyptic number.

It is an amenable number.

18266202685 is a deficient number, since it is larger than the sum of its proper divisors (3653240543).

18266202685 is an equidigital number, since it uses as much as digits as its factorization.

18266202685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3653240542.

The product of its (nonzero) digits is 552960, while the sum is 46.

The spelling of 18266202685 in words is "eighteen billion, two hundred sixty-six million, two hundred two thousand, six hundred eighty-five".