666442860 has 48 divisors (see below), whose sum is σ = 1964256000. Its totient is φ = 168364224.

The previous prime is 666442831. The next prime is 666442877. The reversal of 666442860 is 68244666.

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, 291160 + ... + 293439.

It is an arithmetic number, because the mean of its divisors is an integer number (40922000).

Almost surely, 2^666442860 is an apocalyptic number.

666442860 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666442860 is an abundant number, since it is smaller than the sum of its proper divisors (1297813140).

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

666442860 is a wasteful number, since it uses less digits than its factorization.

666442860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584630 (or 584628 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 42.

The square root of 666442860 is about 25815.5546134496. The cubic root of 666442860 is about 873.4826972290.

The spelling of 666442860 in words is "six hundred sixty-six million, four hundred forty-two thousand, eight hundred sixty".