78071717488543 has 4 divisors (see below), whose sum is σ = 78421814876608. Its totient is φ = 77721620100480.

The previous prime is 78071717488537. The next prime is 78071717488571. The reversal of 78071717488543 is 34588471717087.

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 78071717488543 - 2⁴⁵ = 42887345399711 is a prime.

It is a super-2 number, since 2×78071717488543² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78071717488573) 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, 175048693698 + ... + 175048694143.

It is an arithmetic number, because the mean of its divisors is an integer number (19605453719152).

Almost surely, 2^{78071717488543} is an apocalyptic number.

78071717488543 is a deficient number, since it is larger than the sum of its proper divisors (350097388065).

78071717488543 is a wasteful number, since it uses less digits than its factorization.

78071717488543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350097388064.

The product of its (nonzero) digits is 295034880, while the sum is 70.

The spelling of 78071717488543 in words is "seventy-eight trillion, seventy-one billion, seven hundred seventeen million, four hundred eighty-eight thousand, five hundred forty-three".