671397166 has 16 divisors (see below), whose sum is σ = 1099208880. Its totient is φ = 305025280.

The previous prime is 671397137. The next prime is 671397169. The reversal of 671397166 is 661793176.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671397169) 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, 44190 + ... + 57406.

It is an arithmetic number, because the mean of its divisors is an integer number (68700555).

Almost surely, 2^671397166 is an apocalyptic number.

671397166 is a deficient number, since it is larger than the sum of its proper divisors (427811714).

671397166 is a wasteful number, since it uses less digits than its factorization.

671397166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15539.

The product of its digits is 285768, while the sum is 46.

The square root of 671397166 is about 25911.3327715886. The cubic root of 671397166 is about 875.6418326505.

It can be divided in two parts, 67139 and 7166, that added together give a triangular number (74305 = T₃₈₅).

The spelling of 671397166 in words is "six hundred seventy-one million, three hundred ninety-seven thousand, one hundred sixty-six".