660895 has 8 divisors (see below), whose sum is σ = 799920. Its totient is φ = 524160.

The previous prime is 660893. The next prime is 660899. The reversal of 660895 is 598066.

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

It is not a de Polignac number, because 660895 - 2¹ = 660893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 660895.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660893) 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 7 ways as a sum of consecutive naturals, for example, 151 + ... + 1159.

It is an arithmetic number, because the mean of its divisors is an integer number (99990).

2⁶⁶⁰⁸⁹⁵ is an apocalyptic number.

660895 is a deficient number, since it is larger than the sum of its proper divisors (139025).

660895 is a wasteful number, since it uses less digits than its factorization.

660895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 660895 is about 812.9544882710. The cubic root of 660895 is about 87.1052146709.

It can be divided in two parts, 6608 and 95, that multiplied together give a triangular number (627760 = T₁₁₂₀).

The spelling of 660895 in words is "six hundred sixty thousand, eight hundred ninety-five".