61775041261 has 2 divisors, whose sum is σ = 61775041262. Its totient is φ = 61775041260.

The previous prime is 61775041249. The next prime is 61775041271. The reversal of 61775041261 is 16214057716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43578650025 + 18196391236 = 208755^2 + 134894^2 .

It is a cyclic number.

It is not a de Polignac number, because 61775041261 - 2¹¹ = 61775039213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61775041271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30887520630 + 30887520631.

It is an arithmetic number, because the mean of its divisors is an integer number (30887520631).

Almost surely, 2^61775041261 is an apocalyptic number.

It is an amenable number.

61775041261 is a deficient number, since it is larger than the sum of its proper divisors (1).

61775041261 is an equidigital number, since it uses as much as digits as its factorization.

61775041261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 40.

Adding to 61775041261 its reverse (16214057716), we get a palindrome (77989098977).

The spelling of 61775041261 in words is "sixty-one billion, seven hundred seventy-five million, forty-one thousand, two hundred sixty-one".