5221160665661 has 2 divisors, whose sum is σ = 5221160665662. Its totient is φ = 5221160665660.

The previous prime is 5221160665657. The next prime is 5221160665691. The reversal of 5221160665661 is 1665660611225.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4889378905636 + 331781760025 = 2211194^2 + 576005^2 .

It is a cyclic number.

It is not a de Polignac number, because 5221160665661 - 2² = 5221160665657 is a prime.

It is a super-3 number, since 3×5221160665661³ (a number of 39 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5221160665621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2610580332830 + 2610580332831.

It is an arithmetic number, because the mean of its divisors is an integer number (2610580332831).

Almost surely, 2^{5221160665661} is an apocalyptic number.

It is an amenable number.

5221160665661 is a deficient number, since it is larger than the sum of its proper divisors (1).

5221160665661 is an equidigital number, since it uses as much as digits as its factorization.

5221160665661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777600, while the sum is 47.

The spelling of 5221160665661 in words is "five trillion, two hundred twenty-one billion, one hundred sixty million, six hundred sixty-five thousand, six hundred sixty-one".