660455 has 8 divisors (see below), whose sum is σ = 818304. Its totient is φ = 511200.

The previous prime is 660449. The next prime is 660493. The reversal of 660455 is 554066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 660455 - 2⁶ = 660391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1976 + ... + 2285.

It is an arithmetic number, because the mean of its divisors is an integer number (102288).

2⁶⁶⁰⁴⁵⁵ is an apocalyptic number.

660455 is a deficient number, since it is larger than the sum of its proper divisors (157849).

660455 is a wasteful number, since it uses less digits than its factorization.

660455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4297.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 660455 is about 812.6838253589. The cubic root of 660455 is about 87.0858798784.

The spelling of 660455 in words is "six hundred sixty thousand, four hundred fifty-five".