120661056661 has 2 divisors, whose sum is σ = 120661056662. Its totient is φ = 120661056660.

The previous prime is 120661056583. The next prime is 120661056667. The reversal of 120661056661 is 166650166021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111443136561 + 9217920100 = 333831^2 + 96010^2 .

It is a cyclic number.

It is not a de Polignac number, because 120661056661 - 2¹⁵ = 120661023893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120661056667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60330528330 + 60330528331.

It is an arithmetic number, because the mean of its divisors is an integer number (60330528331).

Almost surely, 2^120661056661 is an apocalyptic number.

It is an amenable number.

120661056661 is a deficient number, since it is larger than the sum of its proper divisors (1).

120661056661 is an equidigital number, since it uses as much as digits as its factorization.

120661056661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 120661056661 in words is "one hundred twenty billion, six hundred sixty-one million, fifty-six thousand, six hundred sixty-one".