61065660065551 has 2 divisors, whose sum is σ = 61065660065552. Its totient is φ = 61065660065550.

The previous prime is 61065660065549. The next prime is 61065660065563. The reversal of 61065660065551 is 15556006656016.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61065660065551 - 2¹ = 61065660065549 is a prime.

Together with 61065660065549, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61065660665551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30532830032775 + 30532830032776.

It is an arithmetic number, because the mean of its divisors is an integer number (30532830032776).

Almost surely, 2^{61065660065551} is an apocalyptic number.

61065660065551 is a deficient number, since it is larger than the sum of its proper divisors (1).

61065660065551 is an equidigital number, since it uses as much as digits as its factorization.

61065660065551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860000, while the sum is 52.

The spelling of 61065660065551 in words is "sixty-one trillion, sixty-five billion, six hundred sixty million, sixty-five thousand, five hundred fifty-one".