1325336661 has 20 divisors (see below), whose sum is σ = 2159809344. Its totient is φ = 803233800.

The previous prime is 1325336657. The next prime is 1325336671. The reversal of 1325336661 is 1666335231.

It is not a de Polignac number, because 1325336661 - 2² = 1325336657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1325336651) 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 19 ways as a sum of consecutive naturals, for example, 742845 + ... + 744626.

Almost surely, 2^1325336661 is an apocalyptic number.

1325336661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1325336661 is a deficient number, since it is larger than the sum of its proper divisors (834472683).

1325336661 is a wasteful number, since it uses less digits than its factorization.

1325336661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1487494 (or 1487485 counting only the distinct ones).

The product of its digits is 58320, while the sum is 36.

The square root of 1325336661 is about 36405.1735471760. The cubic root of 1325336661 is about 1098.4376334847.

The spelling of 1325336661 in words is "one billion, three hundred twenty-five million, three hundred thirty-six thousand, six hundred sixty-one".