78385848717 has 16 divisors (see below), whose sum is σ = 118972988928. Its totient is φ = 45441071280.

The previous prime is 78385848703. The next prime is 78385848721. The reversal of 78385848717 is 71784858387.

It is not a de Polignac number, because 78385848717 - 2⁷ = 78385848589 is a prime.

It is a super-2 number, since 2×78385848717² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78385848767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51636823 + ... + 51638340.

It is an arithmetic number, because the mean of its divisors is an integer number (7435811808).

Almost surely, 2^78385848717 is an apocalyptic number.

It is an amenable number.

78385848717 is a deficient number, since it is larger than the sum of its proper divisors (40587140211).

78385848717 is a wasteful number, since it uses less digits than its factorization.

78385848717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103275200.

The product of its digits is 84295680, while the sum is 66.

The spelling of 78385848717 in words is "seventy-eight billion, three hundred eighty-five million, eight hundred forty-eight thousand, seven hundred seventeen".