61785056609 has 2 divisors, whose sum is σ = 61785056610. Its totient is φ = 61785056608.

The previous prime is 61785056603. The next prime is 61785056629. The reversal of 61785056609 is 90665058716.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59606781025 + 2178275584 = 244145^2 + 46672^2 .

It is a cyclic number.

It is not a de Polignac number, because 61785056609 - 2³² = 57490089313 is a prime.

It is not a weakly prime, because it can be changed into another prime (61785056603) 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, 30892528304 + 30892528305.

It is an arithmetic number, because the mean of its divisors is an integer number (30892528305).

Almost surely, 2^61785056609 is an apocalyptic number.

It is an amenable number.

61785056609 is a deficient number, since it is larger than the sum of its proper divisors (1).

61785056609 is an equidigital number, since it uses as much as digits as its factorization.

61785056609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2721600, while the sum is 53.

The spelling of 61785056609 in words is "sixty-one billion, seven hundred eighty-five million, fifty-six thousand, six hundred nine".