660558 has 16 divisors (see below), whose sum is σ = 1337040. Its totient is φ = 217536.

The previous prime is 660557. The next prime is 660559. The reversal of 660558 is 855066.

It is an interprime number because it is at equal distance from previous prime (660557) and next prime (660559).

It is a super-3 number, since 3×660558³ = 864677433223383336, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660557) 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, 85 + ... + 1152.

It is an arithmetic number, because the mean of its divisors is an integer number (83565).

2⁶⁶⁰⁵⁵⁸ is an apocalyptic number.

660558 is an abundant number, since it is smaller than the sum of its proper divisors (676482).

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

660558 is a wasteful number, since it uses less digits than its factorization.

660558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 660558 is about 812.7471931665. The cubic root of 660558 is about 87.0904067472.

The spelling of 660558 in words is "six hundred sixty thousand, five hundred fifty-eight".