18615909485 has 4 divisors (see below), whose sum is σ = 22339091388. Its totient is φ = 14892727584.

The previous prime is 18615909463. The next prime is 18615909497. The reversal of 18615909485 is 58490951681.

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 4026410116 + 14589499369 = 63454^2 + 120787^2 .

It is a cyclic number.

It is not a de Polignac number, because 18615909485 - 2⁶ = 18615909421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18615909485.

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 3 ways as a sum of consecutive naturals, for example, 1861590944 + ... + 1861590953.

It is an arithmetic number, because the mean of its divisors is an integer number (5584772847).

Almost surely, 2^18615909485 is an apocalyptic number.

It is an amenable number.

18615909485 is a deficient number, since it is larger than the sum of its proper divisors (3723181903).

18615909485 is an equidigital number, since it uses as much as digits as its factorization.

18615909485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3723181902.

The product of its (nonzero) digits is 3110400, while the sum is 56.

The spelling of 18615909485 in words is "eighteen billion, six hundred fifteen million, nine hundred nine thousand, four hundred eighty-five".