78001313865617 has 8 divisors (see below), whose sum is σ = 78420260309160. Its totient is φ = 77583448575360.

The previous prime is 78001313865577. The next prime is 78001313865691. The reversal of 78001313865617 is 71656831310087.

It can be written as a sum of positive squares in 4 ways, for example, as 214717317376 + 77786596548241 = 463376^2 + 8819671^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 78001313865617 - 2³² = 77997018898321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78001313865697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 270143642 + ... + 270432227.

It is an arithmetic number, because the mean of its divisors is an integer number (9802532538645).

Almost surely, 2^{78001313865617} is an apocalyptic number.

It is an amenable number.

78001313865617 is a deficient number, since it is larger than the sum of its proper divisors (418946443543).

78001313865617 is a wasteful number, since it uses less digits than its factorization.

78001313865617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540576643.

The product of its (nonzero) digits is 5080320, while the sum is 56.

The spelling of 78001313865617 in words is "seventy-eight trillion, one billion, three hundred thirteen million, eight hundred sixty-five thousand, six hundred seventeen".