660666660 has 48 divisors (see below), whose sum is σ = 1881230400. Its totient is φ = 173190784.

The previous prime is 660666653. The next prime is 660666673. The reversal of 660666660 is 66666066.

660666660 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89775 + ... + 96854.

It is an arithmetic number, because the mean of its divisors is an integer number (39192300).

Almost surely, 2^660666660 is an apocalyptic number.

660666660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

660666660 is an abundant number, since it is smaller than the sum of its proper divisors (1220563740).

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

660666660 is a wasteful number, since it uses less digits than its factorization.

660666660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186700 (or 186698 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 42.

The square root of 660666660 is about 25703.4367351917. The cubic root of 660666660 is about 870.9518186398.

The spelling of 660666660 in words is "six hundred sixty million, six hundred sixty-six thousand, six hundred sixty".