4535491661 has 2 divisors, whose sum is σ = 4535491662. Its totient is φ = 4535491660.

The previous prime is 4535491657. The next prime is 4535491699. The reversal of 4535491661 is 1661945354.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2938290436 + 1597201225 = 54206^2 + 39965^2 .

It is a cyclic number.

It is not a de Polignac number, because 4535491661 - 2² = 4535491657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4535491061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2267745830 + 2267745831.

It is an arithmetic number, because the mean of its divisors is an integer number (2267745831).

Almost surely, 2^4535491661 is an apocalyptic number.

It is an amenable number.

4535491661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4535491661 is an equidigital number, since it uses as much as digits as its factorization.

4535491661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 388800, while the sum is 44.

The square root of 4535491661 is about 67346.0589864025. The cubic root of 4535491661 is about 1655.2926662718.

The spelling of 4535491661 in words is "four billion, five hundred thirty-five million, four hundred ninety-one thousand, six hundred sixty-one".