18718551568 has 20 divisors (see below), whose sum is σ = 36294730560. Its totient is φ = 9352169504.

The previous prime is 18718551557. The next prime is 18718551569. The reversal of 18718551568 is 86515581781.

It is not an unprimeable number, because it can be changed into a prime (18718551569) 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 3 ways as a sum of consecutive naturals, for example, 422380 + ... + 464587.

It is an arithmetic number, because the mean of its divisors is an integer number (1814736528).

Almost surely, 2^18718551568 is an apocalyptic number.

It is an amenable number.

18718551568 is a deficient number, since it is larger than the sum of its proper divisors (17576178992).

18718551568 is a wasteful number, since it uses less digits than its factorization.

18718551568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888294 (or 888288 counting only the distinct ones).

The product of its digits is 2688000, while the sum is 55.

The spelling of 18718551568 in words is "eighteen billion, seven hundred eighteen million, five hundred fifty-one thousand, five hundred sixty-eight".