18090857845 has 8 divisors (see below), whose sum is σ = 21710101176. Its totient is φ = 14471971776.

The previous prime is 18090857821. The next prime is 18090857867. The reversal of 18090857845 is 54875809081.

It can be written as a sum of positive squares in 4 ways, for example, as 466171281 + 17624686564 = 21591^2 + 132758^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18090857845 - 2¹³ = 18090849653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 38799 + ... + 194131.

It is an arithmetic number, because the mean of its divisors is an integer number (2713762647).

Almost surely, 2^18090857845 is an apocalyptic number.

It is an amenable number.

18090857845 is a deficient number, since it is larger than the sum of its proper divisors (3619243331).

18090857845 is a wasteful number, since it uses less digits than its factorization.

18090857845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178631.

The product of its (nonzero) digits is 3225600, while the sum is 55.

The spelling of 18090857845 in words is "eighteen billion, ninety million, eight hundred fifty-seven thousand, eight hundred forty-five".