61717943407078 has 64 divisors (see below), whose sum is σ = 112057756812288. Its totient is φ = 24921195932160.

The previous prime is 61717943407067. The next prime is 61717943407123. The reversal of 61717943407078 is 87070434971716.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 342526626 + ... + 342706762.

It is an arithmetic number, because the mean of its divisors is an integer number (1750902450192).

Almost surely, 2^{61717943407078} is an apocalyptic number.

61717943407078 is a deficient number, since it is larger than the sum of its proper divisors (50339813405210).

61717943407078 is a wasteful number, since it uses less digits than its factorization.

61717943407078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196117.

The product of its (nonzero) digits is 49787136, while the sum is 64.

The spelling of 61717943407078 in words is "sixty-one trillion, seven hundred seventeen billion, nine hundred forty-three million, four hundred seven thousand, seventy-eight".