686171268770 has 32 divisors (see below), whose sum is σ = 1408358771568. Its totient is φ = 238452277248.

The previous prime is 686171268751. The next prime is 686171268779. The reversal of 686171268770 is 77862171686.

It can be written as a sum of positive squares in 8 ways, for example, as 288097342009 + 398073926761 = 536747^2 + 630931^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (686171268779) 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 15 ways as a sum of consecutive naturals, for example, 155240159 + ... + 155244578.

Almost surely, 2^686171268770 is an apocalyptic number.

686171268770 is an abundant number, since it is smaller than the sum of its proper divisors (722187502798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686171268770 is a wasteful number, since it uses less digits than its factorization.

686171268770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310484774.

The product of its (nonzero) digits is 9483264, while the sum is 59.

The spelling of 686171268770 in words is "six hundred eighty-six billion, one hundred seventy-one million, two hundred sixty-eight thousand, seven hundred seventy".