18505561014 has 24 divisors (see below), whose sum is σ = 40305313152. Its totient is φ = 6136223280.

The previous prime is 18505561003. The next prime is 18505561049. The reversal of 18505561014 is 41016550581.

18505561014 is a `hidden beast` number, since 1 + 85 + 0 + 5 + 561 + 0 + 14 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 18505561014.

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 11 ways as a sum of consecutive naturals, for example, 2687889 + ... + 2694764.

It is an arithmetic number, because the mean of its divisors is an integer number (1679388048).

Almost surely, 2^18505561014 is an apocalyptic number.

18505561014 is an abundant number, since it is smaller than the sum of its proper divisors (21799752138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18505561014 is a wasteful number, since it uses less digits than its factorization.

18505561014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5382852 (or 5382849 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 36.

The spelling of 18505561014 in words is "eighteen billion, five hundred five million, five hundred sixty-one thousand, fourteen".