61717943407079 has 4 divisors (see below), whose sum is σ = 61718173788384. Its totient is φ = 61717713025776.

The previous prime is 61717943407067. The next prime is 61717943407123. The reversal of 61717943407079 is 97070434971716.

61717943407079 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61717943407079 - 2³² = 61713648439783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61717943407579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114788342 + ... + 115324755.

It is an arithmetic number, because the mean of its divisors is an integer number (15429543447096).

Almost surely, 2^{61717943407079} is an apocalyptic number.

61717943407079 is a deficient number, since it is larger than the sum of its proper divisors (230381305).

61717943407079 is a wasteful number, since it uses less digits than its factorization.

61717943407079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230381304.

The product of its (nonzero) digits is 56010528, while the sum is 65.

The spelling of 61717943407079 in words is "sixty-one trillion, seven hundred seventeen billion, nine hundred forty-three million, four hundred seven thousand, seventy-nine".