671560666 has 16 divisors (see below), whose sum is σ = 1151743104. Its totient is φ = 287687664.

The previous prime is 671560621. The next prime is 671560667. The reversal of 671560666 is 666065176.

It is not an unprimeable number, because it can be changed into a prime (671560667) 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, 28276 + ... + 46288.

It is an arithmetic number, because the mean of its divisors is an integer number (71983944).

Almost surely, 2^671560666 is an apocalyptic number.

671560666 is a deficient number, since it is larger than the sum of its proper divisors (480182438).

671560666 is a wasteful number, since it uses less digits than its factorization.

671560666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20685.

The product of its (nonzero) digits is 272160, while the sum is 43.

The square root of 671560666 is about 25914.4875696974. The cubic root of 671560666 is about 875.7129062400.

The spelling of 671560666 in words is "six hundred seventy-one million, five hundred sixty thousand, six hundred sixty-six".