671701665 has 8 divisors (see below), whose sum is σ = 1074722688. Its totient is φ = 358240880.

The previous prime is 671701651. The next prime is 671701669. The reversal of 671701665 is 566107176.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 671701665 - 2⁴ = 671701649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (671701669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22390041 + ... + 22390070.

It is an arithmetic number, because the mean of its divisors is an integer number (134340336).

Almost surely, 2^671701665 is an apocalyptic number.

It is an amenable number.

671701665 is a deficient number, since it is larger than the sum of its proper divisors (403021023).

671701665 is a wasteful number, since it uses less digits than its factorization.

671701665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44780119.

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 671701665 is about 25917.2078935984. The cubic root of 671701665 is about 875.7741893625.

The spelling of 671701665 in words is "six hundred seventy-one million, seven hundred one thousand, six hundred sixty-five".