1325426661 has 12 divisors (see below), whose sum is σ = 2061774988. Its totient is φ = 815647104.

The previous prime is 1325426653. The next prime is 1325426677. The reversal of 1325426661 is 1666245231.

It can be written as a sum of positive squares in 2 ways, for example, as 155376225 + 1170050436 = 12465^2 + 34206^2 .

It is not a de Polignac number, because 1325426661 - 2³ = 1325426653 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1325426611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5664100 + ... + 5664333.

Almost surely, 2^1325426661 is an apocalyptic number.

It is an amenable number.

1325426661 is a deficient number, since it is larger than the sum of its proper divisors (736348327).

1325426661 is a wasteful number, since it uses less digits than its factorization.

1325426661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11328452 (or 11328449 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 1325426661 is about 36406.4096142424. The cubic root of 1325426661 is about 1098.4624968905.

The spelling of 1325426661 in words is "one billion, three hundred twenty-five million, four hundred twenty-six thousand, six hundred sixty-one".