61281716579 has 2 divisors, whose sum is σ = 61281716580. Its totient is φ = 61281716578.

The previous prime is 61281716477. The next prime is 61281716581. The reversal of 61281716579 is 97561718216.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61281716579 - 2²⁴ = 61264939363 is a prime.

It is a Sophie Germain prime.

Together with 61281716581, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61281716579.

It is not a weakly prime, because it can be changed into another prime (61281716179) 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, 30640858289 + 30640858290.

It is an arithmetic number, because the mean of its divisors is an integer number (30640858290).

Almost surely, 2^61281716579 is an apocalyptic number.

61281716579 is a deficient number, since it is larger than the sum of its proper divisors (1).

61281716579 is an equidigital number, since it uses as much as digits as its factorization.

61281716579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1270080, while the sum is 53.

The spelling of 61281716579 in words is "sixty-one billion, two hundred eighty-one million, seven hundred sixteen thousand, five hundred seventy-nine".