660501 has 16 divisors (see below), whose sum is σ = 1036800. Its totient is φ = 414144.

The previous prime is 660493. The next prime is 660503. The reversal of 660501 is 105066.

660501 is a `hidden beast` number, since 660 + 5 + 0 + 1 = 666.

It is not a de Polignac number, because 660501 - 2³ = 660493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261 + ... + 1178.

It is an arithmetic number, because the mean of its divisors is an integer number (64800).

2⁶⁶⁰⁵⁰¹ is an apocalyptic number.

It is an amenable number.

660501 is a deficient number, since it is larger than the sum of its proper divisors (376299).

660501 is a wasteful number, since it uses less digits than its factorization.

660501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1465 (or 1459 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 660501 is about 812.7121261554. The cubic root of 660501 is about 87.0879016450.

Adding to 660501 its reverse (105066), we get a palindrome (765567).

The spelling of 660501 in words is "six hundred sixty thousand, five hundred one".