661675 has 24 divisors (see below), whose sum is σ = 992000. Its totient is φ = 427680.

The previous prime is 661673. The next prime is 661679. The reversal of 661675 is 576166.

661675 = 113² + 114² + ... + 150².

It is not a de Polignac number, because 661675 - 2¹ = 661673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661673) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3226 + ... + 3424.

2⁶⁶¹⁶⁷⁵ is an apocalyptic number.

661675 is a deficient number, since it is larger than the sum of its proper divisors (330325).

661675 is a wasteful number, since it uses less digits than its factorization.

661675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235 (or 230 counting only the distinct ones).

The product of its digits is 7560, while the sum is 31.

The square root of 661675 is about 813.4340784600. The cubic root of 661675 is about 87.1394689050.

The spelling of 661675 in words is "six hundred sixty-one thousand, six hundred seventy-five".