78585785723 has 4 divisors (see below), whose sum is σ = 78591448008. Its totient is φ = 78580123440.

The previous prime is 78585785713. The next prime is 78585785731. The reversal of 78585785723 is 32758758587.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32758758587 = 127 ⋅257942981.

It is a cyclic number.

It is not a de Polignac number, because 78585785723 - 2⁶ = 78585785659 is a prime.

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 78585785723.

It is not an unprimeable number, because it can be changed into a prime (78585785713) 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, 2810273 + ... + 2838098.

It is an arithmetic number, because the mean of its divisors is an integer number (19647862002).

Almost surely, 2^78585785723 is an apocalyptic number.

78585785723 is a deficient number, since it is larger than the sum of its proper divisors (5662285).

78585785723 is a wasteful number, since it uses less digits than its factorization.

78585785723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5662284.

The product of its digits is 131712000, while the sum is 65.

The spelling of 78585785723 in words is "seventy-eight billion, five hundred eighty-five million, seven hundred eighty-five thousand, seven hundred twenty-three".