78316786547 has 4 divisors (see below), whose sum is σ = 78319277400. Its totient is φ = 78314295696.

The previous prime is 78316786523. The next prime is 78316786577. The reversal of 78316786547 is 74568761387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74568761387 = 4159 ⋅17929493.

It is a cyclic number.

It is not a de Polignac number, because 78316786547 - 2⁸ = 78316786291 is a prime.

It is a super-2 number, since 2×78316786547² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78316786547.

It is not an unprimeable number, because it can be changed into a prime (78316786517) 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, 1197653 + ... + 1261350.

It is an arithmetic number, because the mean of its divisors is an integer number (19579819350).

Almost surely, 2^78316786547 is an apocalyptic number.

78316786547 is a deficient number, since it is larger than the sum of its proper divisors (2490853).

78316786547 is a wasteful number, since it uses less digits than its factorization.

78316786547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2490852.

The product of its digits is 47416320, while the sum is 62.

The spelling of 78316786547 in words is "seventy-eight billion, three hundred sixteen million, seven hundred eighty-six thousand, five hundred forty-seven".