660863 has 6 divisors (see below), whose sum is σ = 768816. Its totient is φ = 566412.

The previous prime is 660853. The next prime is 660887. The reversal of 660863 is 368066.

It is not a de Polignac number, because 660863 - 2⁶ = 660799 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 (660833) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6695 + ... + 6792.

It is an arithmetic number, because the mean of its divisors is an integer number (128136).

2⁶⁶⁰⁸⁶³ is an apocalyptic number.

660863 is a deficient number, since it is larger than the sum of its proper divisors (107953).

660863 is a wasteful number, since it uses less digits than its factorization.

660863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13501 (or 13494 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 660863 is about 812.9348067342. The cubic root of 660863 is about 87.1038087936.

The spelling of 660863 in words is "six hundred sixty thousand, eight hundred sixty-three".