18500053709 has 8 divisors (see below), whose sum is σ = 18923109528. Its totient is φ = 18080861760.

The previous prime is 18500053669. The next prime is 18500053717. The reversal of 18500053709 is 90735000581.

It can be written as a sum of positive squares in 4 ways, for example, as 2606408809 + 15893644900 = 51053^2 + 126070^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18500053709 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 (18500053009) by changing a digit.

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, 956282 + ... + 975435.

It is an arithmetic number, because the mean of its divisors is an integer number (2365388691).

Almost surely, 2^18500053709 is an apocalyptic number.

It is an amenable number.

18500053709 is a deficient number, since it is larger than the sum of its proper divisors (423055819).

18500053709 is a wasteful number, since it uses less digits than its factorization.

18500053709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1931935.

The product of its (nonzero) digits is 37800, while the sum is 38.

The spelling of 18500053709 in words is "eighteen billion, five hundred million, fifty-three thousand, seven hundred nine".