18181864280 has 32 divisors (see below), whose sum is σ = 40984032240. Its totient is φ = 7259441280.

The previous prime is 18181864243. The next prime is 18181864307. The reversal of 18181864280 is 8246818181.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 393611 + ... + 437370.

Almost surely, 2^18181864280 is an apocalyptic number.

18181864280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18181864280 is an abundant number, since it is smaller than the sum of its proper divisors (22802167960).

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

18181864280 is a wasteful number, since it uses less digits than its factorization.

18181864280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831539 (or 831535 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 47.

The spelling of 18181864280 in words is "eighteen billion, one hundred eighty-one million, eight hundred sixty-four thousand, two hundred eighty".