660461 has 4 divisors (see below), whose sum is σ = 662112. Its totient is φ = 658812.

The previous prime is 660449. The next prime is 660493. The reversal of 660461 is 164066.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 660461 - 2¹⁰ = 659437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660461.

It is not an unprimeable number, because it can be changed into a prime (660061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200 + ... + 1166.

It is an arithmetic number, because the mean of its divisors is an integer number (165528).

2⁶⁶⁰⁴⁶¹ is an apocalyptic number.

It is an amenable number.

660461 is a deficient number, since it is larger than the sum of its proper divisors (1651).

660461 is an equidigital number, since it uses as much as digits as its factorization.

660461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 660461 is about 812.6875168230. The cubic root of 660461 is about 87.0861435924.

The spelling of 660461 in words is "six hundred sixty thousand, four hundred sixty-one".