660653 has 4 divisors (see below), whose sum is σ = 755040. Its totient is φ = 566268.

The previous prime is 660643. The next prime is 660659. The reversal of 660653 is 356066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 660653 - 2⁶ = 660589 is a prime.

It is a Duffinian number.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 47183 + ... + 47196.

It is an arithmetic number, because the mean of its divisors is an integer number (188760).

2⁶⁶⁰⁶⁵³ is an apocalyptic number.

It is an amenable number.

660653 is a deficient number, since it is larger than the sum of its proper divisors (94387).

660653 is an equidigital number, since it uses as much as digits as its factorization.

660653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94386.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 660653 is about 812.8056348230. The cubic root of 660653 is about 87.0945815974.

The spelling of 660653 in words is "six hundred sixty thousand, six hundred fifty-three".