16661066660 has 96 divisors (see below), whose sum is σ = 42246005760. Its totient is φ = 5397977088.

The previous prime is 16661066657. The next prime is 16661066683. The reversal of 16661066660 is 6666016661.

16661066660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×16661066660² (a number of 21 digits) contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 147164 + ... + 234476.

It is an arithmetic number, because the mean of its divisors is an integer number (440062560).

Almost surely, 2^16661066660 is an apocalyptic number.

16661066660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16661066660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21123002880).

16661066660 is an abundant number, since it is smaller than the sum of its proper divisors (25584939100).

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

16661066660 is a wasteful number, since it uses less digits than its factorization.

16661066660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87405 (or 87403 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 44.

The spelling of 16661066660 in words is "sixteen billion, six hundred sixty-one million, sixty-six thousand, six hundred sixty".