661325 has 12 divisors (see below), whose sum is σ = 937440. Its totient is φ = 453360.

The previous prime is 661321. The next prime is 661327. The reversal of 661325 is 523166.

661325 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 661325 - 2² = 661321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 661325.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1715 + ... + 2064.

It is an arithmetic number, because the mean of its divisors is an integer number (78120).

2⁶⁶¹³²⁵ is an apocalyptic number.

It is an amenable number.

661325 is a deficient number, since it is larger than the sum of its proper divisors (276115).

661325 is a wasteful number, since it uses less digits than its factorization.

661325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3796 (or 3791 counting only the distinct ones).

The product of its digits is 1080, while the sum is 23.

The square root of 661325 is about 813.2189127166. The cubic root of 661325 is about 87.1241017468.

The spelling of 661325 in words is "six hundred sixty-one thousand, three hundred twenty-five".