785666666587 has 24 divisors (see below), whose sum is σ = 872776749600. Its totient is φ = 706649856000.

The previous prime is 785666666479. The next prime is 785666666611.

785666666587 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 785666666587 - 2⁷ = 785666666459 is a prime.

It is a super-2 number, since 2×785666666587² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (785666666387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17074203 + ... + 17120155.

It is an arithmetic number, because the mean of its divisors is an integer number (36365697900).

Almost surely, 2^785666666587 is an apocalyptic number.

785666666587 is a deficient number, since it is larger than the sum of its proper divisors (87110083013).

785666666587 is a wasteful number, since it uses less digits than its factorization.

785666666587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47475 (or 47464 counting only the distinct ones).

The product of its digits is 3657830400, while the sum is 76.

It can be divided in two parts, 78 and 5666666587, that added together give a palindrome (5666666665).

The spelling of 785666666587 in words is "seven hundred eighty-five billion, six hundred sixty-six million, six hundred sixty-six thousand, five hundred eighty-seven".