661326032 has 10 divisors (see below), whose sum is σ = 1281319218. Its totient is φ = 330663008.

The previous prime is 661326031. The next prime is 661326037. The reversal of 661326032 is 230623166.

It can be written as a sum of positive squares in only one way, i.e., 506970256 + 154355776 = 22516^2 + 12424^2 .

It is a junction number, because it is equal to n+sod(n) for n = 661325986 and 661326004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661326031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20666423 + ... + 20666454.

Almost surely, 2^661326032 is an apocalyptic number.

It is an amenable number.

661326032 is a deficient number, since it is larger than the sum of its proper divisors (619993186).

661326032 is a wasteful number, since it uses less digits than its factorization.

661326032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41332885 (or 41332879 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 661326032 is about 25716.2600702357. The cubic root of 661326032 is about 871.2414706591.

Adding to 661326032 its reverse (230623166), we get a palindrome (891949198).

The spelling of 661326032 in words is "six hundred sixty-one million, three hundred twenty-six thousand, thirty-two".