5306557661 has 2 divisors, whose sum is σ = 5306557662. Its totient is φ = 5306557660.

The previous prime is 5306557643. The next prime is 5306557673. The reversal of 5306557661 is 1667556035.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3756954436 + 1549603225 = 61294^2 + 39365^2 .

It is a cyclic number.

It is not a de Polignac number, because 5306557661 - 2¹⁸ = 5306295517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5306557261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2653278830 + 2653278831.

It is an arithmetic number, because the mean of its divisors is an integer number (2653278831).

Almost surely, 2^5306557661 is an apocalyptic number.

It is an amenable number.

5306557661 is a deficient number, since it is larger than the sum of its proper divisors (1).

5306557661 is an equidigital number, since it uses as much as digits as its factorization.

5306557661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 567000, while the sum is 44.

The square root of 5306557661 is about 72846.1231706945. The cubic root of 5306557661 is about 1744.2321847614.

The spelling of 5306557661 in words is "five billion, three hundred six million, five hundred fifty-seven thousand, six hundred sixty-one".