661335 has 8 divisors (see below), whose sum is σ = 1058160. Its totient is φ = 352704.

The previous prime is 661327. The next prime is 661343. The reversal of 661335 is 533166.

It is an interprime number because it is at equal distance from previous prime (661327) and next prime (661343).

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

It is not a de Polignac number, because 661335 - 2³ = 661327 is a prime.

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, 22030 + ... + 22059.

It is an arithmetic number, because the mean of its divisors is an integer number (132270).

2⁶⁶¹³³⁵ is an apocalyptic number.

661335 is a deficient number, since it is larger than the sum of its proper divisors (396825).

661335 is a wasteful number, since it uses less digits than its factorization.

661335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44097.

The product of its digits is 1620, while the sum is 24.

The square root of 661335 is about 813.2250610993. The cubic root of 661335 is about 87.1245408837.

The spelling of 661335 in words is "six hundred sixty-one thousand, three hundred thirty-five".