661332 has 24 divisors (see below), whose sum is σ = 1763776. Its totient is φ = 188928.

The previous prime is 661327. The next prime is 661343. The reversal of 661332 is 233166.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 661299 and 661308.

It is a congruent number.

It is an unprimeable number.

661332 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3853 + ... + 4020.

2⁶⁶¹³³² is an apocalyptic number.

It is an amenable number.

661332 is an abundant number, since it is smaller than the sum of its proper divisors (1102444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661332 is a wasteful number, since it uses less digits than its factorization.

661332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7887 (or 7885 counting only the distinct ones).

The product of its digits is 648, while the sum is 21.

The square root of 661332 is about 813.2232165894. The cubic root of 661332 is about 87.1244091431.

Adding to 661332 its reverse (233166), we get a palindrome (894498).

The spelling of 661332 in words is "six hundred sixty-one thousand, three hundred thirty-two".