688962269885 has 4 divisors (see below), whose sum is σ = 826754723868. Its totient is φ = 551169815904.

The previous prime is 688962269869. The next prime is 688962269887. The reversal of 688962269885 is 588962269886.

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

It can be written as a sum of positive squares in 2 ways, for example, as 156292924921 + 532669344964 = 395339^2 + 729842^2 .

It is a cyclic number.

It is not a de Polignac number, because 688962269885 - 2⁴ = 688962269869 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 (688962269887) 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, 68896226984 + ... + 68896226993.

It is an arithmetic number, because the mean of its divisors is an integer number (206688680967).

Almost surely, 2^688962269885 is an apocalyptic number.

It is an amenable number.

688962269885 is a deficient number, since it is larger than the sum of its proper divisors (137792453983).

688962269885 is a wasteful number, since it uses less digits than its factorization.

688962269885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137792453982.

The product of its digits is 1433272320, while the sum is 77.

Subtracting from 688962269885 its reverse (588962269886), we obtain a palindrome (99999999999).

The spelling of 688962269885 in words is "six hundred eighty-eight billion, nine hundred sixty-two million, two hundred sixty-nine thousand, eight hundred eighty-five".