18217555104 has 48 divisors (see below), whose sum is σ = 54652667328. Its totient is φ = 5205015552.

The previous prime is 18217555087. The next prime is 18217555123. The reversal of 18217555104 is 40155571281.

It is a tau number, because it is divible by the number of its divisors (48).

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, 13554057 + ... + 13555400.

It is an arithmetic number, because the mean of its divisors is an integer number (1138597236).

Almost surely, 2^18217555104 is an apocalyptic number.

18217555104 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18217555104 is an abundant number, since it is smaller than the sum of its proper divisors (36435112224).

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

18217555104 is a wasteful number, since it uses less digits than its factorization.

18217555104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27109477 (or 27109469 counting only the distinct ones).

The product of its (nonzero) digits is 56000, while the sum is 39.

The spelling of 18217555104 in words is "eighteen billion, two hundred seventeen million, five hundred fifty-five thousand, one hundred four".