18181566680 has 32 divisors (see below), whose sum is σ = 40929189840. Its totient is φ = 7268952960.

The previous prime is 18181566643. The next prime is 18181566703. The reversal of 18181566680 is 8666518181.

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 7 ways as a sum of consecutive naturals, for example, 33926 + ... + 193685.

Almost surely, 2^18181566680 is an apocalyptic number.

18181566680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18181566680 is an abundant number, since it is smaller than the sum of its proper divisors (22747623160).

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

18181566680 is a wasteful number, since it uses less digits than its factorization.

18181566680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229619 (or 229615 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 50.

The spelling of 18181566680 in words is "eighteen billion, one hundred eighty-one million, five hundred sixty-six thousand, six hundred eighty".