61365963019609 has 2 divisors, whose sum is σ = 61365963019610. Its totient is φ = 61365963019608.

The previous prime is 61365963019591. The next prime is 61365963019643. The reversal of 61365963019609 is 90691036956316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31058295562009 + 30307667457600 = 5572997^2 + 5505240^2 .

It is a cyclic number.

It is not a de Polignac number, because 61365963019609 - 2⁷ = 61365963019481 is a prime.

It is not a weakly prime, because it can be changed into another prime (61365963019679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30682981509804 + 30682981509805.

It is an arithmetic number, because the mean of its divisors is an integer number (30682981509805).

Almost surely, 2^{61365963019609} is an apocalyptic number.

It is an amenable number.

61365963019609 is a deficient number, since it is larger than the sum of its proper divisors (1).

61365963019609 is an equidigital number, since it uses as much as digits as its factorization.

61365963019609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42515280, while the sum is 64.

The spelling of 61365963019609 in words is "sixty-one trillion, three hundred sixty-five billion, nine hundred sixty-three million, nineteen thousand, six hundred nine".