16666818816 has 72 divisors (see below), whose sum is σ = 45440033184. Its totient is φ = 5420093440.

The previous prime is 16666818811. The next prime is 16666818823. The reversal of 16666818816 is 61881866661.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (16666818811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233166 + ... + 296141.

It is an arithmetic number, because the mean of its divisors is an integer number (631111572).

Almost surely, 2^16666818816 is an apocalyptic number.

16666818816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16666818816 is an abundant number, since it is smaller than the sum of its proper divisors (28773214368).

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

16666818816 is an equidigital number, since it uses as much as digits as its factorization.

16666818816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529367 (or 529353 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 57.

The spelling of 16666818816 in words is "sixteen billion, six hundred sixty-six million, eight hundred eighteen thousand, eight hundred sixteen".