1326132661 has 4 divisors (see below), whose sum is σ = 1515580192. Its totient is φ = 1136685132.

The previous prime is 1326132653. The next prime is 1326132671. The reversal of 1326132661 is 1662316231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1662316231 = 43 ⋅38658517.

It is a cyclic number.

It is not a de Polignac number, because 1326132661 - 2³ = 1326132653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1326132671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94723755 + ... + 94723768.

It is an arithmetic number, because the mean of its divisors is an integer number (378895048).

Almost surely, 2^1326132661 is an apocalyptic number.

It is an amenable number.

1326132661 is a deficient number, since it is larger than the sum of its proper divisors (189447531).

1326132661 is an equidigital number, since it uses as much as digits as its factorization.

1326132661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189447530.

The product of its digits is 7776, while the sum is 31.

The square root of 1326132661 is about 36416.1044182378. The cubic root of 1326132661 is about 1098.6574974618.

Adding to 1326132661 its reverse (1662316231), we get a palindrome (2988448892).

The spelling of 1326132661 in words is "one billion, three hundred twenty-six million, one hundred thirty-two thousand, six hundred sixty-one".