91717943407078 has 8 divisors (see below), whose sum is σ = 139514618140560. Its totient is φ = 45213070693560.

The previous prime is 91717943407073. The next prime is 91717943407091. The reversal of 91717943407078 is 87070434971719.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×91717943407078² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91717943407073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322950504813 + ... + 322950505096.

It is an arithmetic number, because the mean of its divisors is an integer number (17439327267570).

Almost surely, 2^{91717943407078} is an apocalyptic number.

91717943407078 is a deficient number, since it is larger than the sum of its proper divisors (47796674733482).

91717943407078 is a wasteful number, since it uses less digits than its factorization.

91717943407078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645901009982.

The product of its (nonzero) digits is 74680704, while the sum is 67.

The spelling of 91717943407078 in words is "ninety-one trillion, seven hundred seventeen billion, nine hundred forty-three million, four hundred seven thousand, seventy-eight".