661322 has 4 divisors (see below), whose sum is σ = 991986. Its totient is φ = 330660.

The previous prime is 661321. The next prime is 661327. The reversal of 661322 is 223166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 337561 + 323761 = 581^2 + 569^2 .

It is a junction number, because it is equal to n+sod(n) for n = 661294 and 661303.

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 as a sum of consecutive naturals, namely, 165329 + ... + 165332.

2⁶⁶¹³²² is an apocalyptic number.

661322 is a deficient number, since it is larger than the sum of its proper divisors (330664).

661322 is a wasteful number, since it uses less digits than its factorization.

661322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330663.

The product of its digits is 432, while the sum is 20.

The square root of 661322 is about 813.2170681927. The cubic root of 661322 is about 87.1239700048.

Adding to 661322 its reverse (223166), we get a palindrome (884488).

The spelling of 661322 in words is "six hundred sixty-one thousand, three hundred twenty-two".