660671 has 8 divisors (see below), whose sum is σ = 763344. Its totient is φ = 565120.

The previous prime is 660661. The next prime is 660683. The reversal of 660671 is 176066.

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

It is a cyclic number.

It is not a de Polignac number, because 660671 - 2⁶ = 660607 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 660671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660601) 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, 1580 + ... + 1953.

It is an arithmetic number, because the mean of its divisors is an integer number (95418).

2⁶⁶⁰⁶⁷¹ is an apocalyptic number.

660671 is a deficient number, since it is larger than the sum of its proper divisors (102673).

660671 is a wasteful number, since it uses less digits than its factorization.

660671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3561.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 660671 is about 812.8167075054. The cubic root of 660671 is about 87.0953725765.

It can be divided in two parts, 660 and 671, that added together give a palindrome (1331).

The spelling of 660671 in words is "six hundred sixty thousand, six hundred seventy-one".