5661165516121 has 2 divisors, whose sum is σ = 5661165516122. Its totient is φ = 5661165516120.

The previous prime is 5661165516107. The next prime is 5661165516187. The reversal of 5661165516121 is 1216155611665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3155241690000 + 2505923826121 = 1776300^2 + 1583011^2 .

It is a cyclic number.

It is not a de Polignac number, because 5661165516121 - 2¹¹ = 5661165514073 is a prime.

It is not a weakly prime, because it can be changed into another prime (5661165516421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2830582758060 + 2830582758061.

It is an arithmetic number, because the mean of its divisors is an integer number (2830582758061).

Almost surely, 2^{5661165516121} is an apocalyptic number.

It is an amenable number.

5661165516121 is a deficient number, since it is larger than the sum of its proper divisors (1).

5661165516121 is an equidigital number, since it uses as much as digits as its factorization.

5661165516121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324000, while the sum is 46.

The spelling of 5661165516121 in words is "five trillion, six hundred sixty-one billion, one hundred sixty-five million, five hundred sixteen thousand, one hundred twenty-one".