660657 has 8 divisors (see below), whose sum is σ = 884800. Its totient is φ = 438480.

The previous prime is 660643. The next prime is 660659. The reversal of 660657 is 756066.

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

It is not a de Polignac number, because 660657 - 2⁶ = 660593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660659) 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, 732 + ... + 1362.

It is an arithmetic number, because the mean of its divisors is an integer number (110600).

2⁶⁶⁰⁶⁵⁷ is an apocalyptic number.

It is an amenable number.

660657 is a deficient number, since it is larger than the sum of its proper divisors (224143).

660657 is a wasteful number, since it uses less digits than its factorization.

660657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 660657 is about 812.8080954321. The cubic root of 660657 is about 87.0947573718.

The spelling of 660657 in words is "six hundred sixty thousand, six hundred fifty-seven".