688169520271 has 4 divisors (see below), whose sum is σ = 688172940832. Its totient is φ = 688166099712.

The previous prime is 688169520209. The next prime is 688169520281. The reversal of 688169520271 is 172025961886.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 688169520271 - 2⁹ = 688169519759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688169520281) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1388295 + ... + 1817608.

It is an arithmetic number, because the mean of its divisors is an integer number (172043235208).

Almost surely, 2^688169520271 is an apocalyptic number.

688169520271 is a deficient number, since it is larger than the sum of its proper divisors (3420561).

688169520271 is a wasteful number, since it uses less digits than its factorization.

688169520271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3420560.

The product of its (nonzero) digits is 2903040, while the sum is 55.

The spelling of 688169520271 in words is "six hundred eighty-eight billion, one hundred sixty-nine million, five hundred twenty thousand, two hundred seventy-one".