61305543017 has 2 divisors, whose sum is σ = 61305543018. Its totient is φ = 61305543016.

The previous prime is 61305543001. The next prime is 61305543023. The reversal of 61305543017 is 71034550316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56503191616 + 4802351401 = 237704^2 + 69299^2 .

It is a cyclic number.

It is not a de Polignac number, because 61305543017 - 2⁴ = 61305543001 is a prime.

It is not a weakly prime, because it can be changed into another prime (61305543037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30652771508 + 30652771509.

It is an arithmetic number, because the mean of its divisors is an integer number (30652771509).

Almost surely, 2^61305543017 is an apocalyptic number.

It is an amenable number.

61305543017 is a deficient number, since it is larger than the sum of its proper divisors (1).

61305543017 is an equidigital number, since it uses as much as digits as its factorization.

61305543017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 35.

The spelling of 61305543017 in words is "sixty-one billion, three hundred five million, five hundred forty-three thousand, seventeen".