678724591785 has 16 divisors (see below), whose sum is σ = 1086479243520. Its totient is φ = 361813150080.

The previous prime is 678724591751. The next prime is 678724591799. The reversal of 678724591785 is 587195427876.

It is not a de Polignac number, because 678724591785 - 2²³ = 678716203177 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10798801 + ... + 10861470.

It is an arithmetic number, because the mean of its divisors is an integer number (67904952720).

Almost surely, 2^678724591785 is an apocalyptic number.

It is an amenable number.

678724591785 is a deficient number, since it is larger than the sum of its proper divisors (407754651735).

678724591785 is a wasteful number, since it uses less digits than its factorization.

678724591785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21662368.

The product of its digits is 237081600, while the sum is 69.

The spelling of 678724591785 in words is "six hundred seventy-eight billion, seven hundred twenty-four million, five hundred ninety-one thousand, seven hundred eighty-five".