671166660 has 24 divisors (see below), whose sum is σ = 1879266816. Its totient is φ = 178977760.

The previous prime is 671166637. The next prime is 671166667. The reversal of 671166660 is 66661176.

It is not an unprimeable number, because it can be changed into a prime (671166667) 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, 5592996 + ... + 5593115.

It is an arithmetic number, because the mean of its divisors is an integer number (78302784).

Almost surely, 2^671166660 is an apocalyptic number.

671166660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

671166660 is an abundant number, since it is smaller than the sum of its proper divisors (1208100156).

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

671166660 is a wasteful number, since it uses less digits than its factorization.

671166660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11186123 (or 11186121 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 671166660 is about 25906.8844132211. The cubic root of 671166660 is about 875.5416118921.

It can be divided in two parts, 671 and 166660, that added together give a triangular number (167331 = T₅₇₈).

The spelling of 671166660 in words is "six hundred seventy-one million, one hundred sixty-six thousand, six hundred sixty".