322611661 has 4 divisors (see below), whose sum is σ = 322648924. Its totient is φ = 322574400.

The previous prime is 322611643. The next prime is 322611673. The reversal of 322611661 is 166116223.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 207907561 + 114704100 = 14419^2 + 10710^2 .

It is a cyclic number.

It is not a de Polignac number, because 322611661 - 2⁵ = 322611629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (322681661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1891 + ... + 25471.

It is an arithmetic number, because the mean of its divisors is an integer number (80662231).

Almost surely, 2^322611661 is an apocalyptic number.

It is an amenable number.

322611661 is a deficient number, since it is larger than the sum of its proper divisors (37263).

322611661 is a wasteful number, since it uses less digits than its factorization.

322611661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37262.

The product of its digits is 2592, while the sum is 28.

The square root of 322611661 is about 17961.3936263309. The cubic root of 322611661 is about 685.8461215658.

Adding to 322611661 its reverse (166116223), we get a palindrome (488727884).

The spelling of 322611661 in words is "three hundred twenty-two million, six hundred eleven thousand, six hundred sixty-one".