181616806680 has 64 divisors (see below), whose sum is σ = 551747289600. Its totient is φ = 47818093440.

The previous prime is 181616806667. The next prime is 181616806687. The reversal of 181616806680 is 86608616181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181616806687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9569466 + ... + 9588425.

It is an arithmetic number, because the mean of its divisors is an integer number (8621051400).

Almost surely, 2^181616806680 is an apocalyptic number.

181616806680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181616806680 is an abundant number, since it is smaller than the sum of its proper divisors (370130482920).

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

181616806680 is a wasteful number, since it uses less digits than its factorization.

181616806680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19157984 (or 19157980 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 51.

The spelling of 181616806680 in words is "one hundred eighty-one billion, six hundred sixteen million, eight hundred six thousand, six hundred eighty".