5661661551001 has 2 divisors, whose sum is σ = 5661661551002. Its totient is φ = 5661661551000.

The previous prime is 5661661550983. The next prime is 5661661551067. The reversal of 5661661551001 is 1001551661665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3469260134025 + 2192401416976 = 1862595^2 + 1480676^2 .

It is a cyclic number.

It is not a de Polignac number, because 5661661551001 - 2⁷ = 5661661550873 is a prime.

It is not a weakly prime, because it can be changed into another prime (5661061551001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2830830775500 + 2830830775501.

It is an arithmetic number, because the mean of its divisors is an integer number (2830830775501).

Almost surely, 2^{5661661551001} is an apocalyptic number.

It is an amenable number.

5661661551001 is a deficient number, since it is larger than the sum of its proper divisors (1).

5661661551001 is an equidigital number, since it uses as much as digits as its factorization.

5661661551001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 5661661551001 in words is "five trillion, six hundred sixty-one billion, six hundred sixty-one million, five hundred fifty-one thousand, one".