689694226818 has 32 divisors (see below), whose sum is σ = 1380783991680. Its totient is φ = 229665605760.

The previous prime is 689694226787. The next prime is 689694226841. The reversal of 689694226818 is 818622496986.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26939968 + ... + 26965556.

It is an arithmetic number, because the mean of its divisors is an integer number (43149499740).

Almost surely, 2^689694226818 is an apocalyptic number.

689694226818 is an abundant number, since it is smaller than the sum of its proper divisors (691089764862).

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

689694226818 is a wasteful number, since it uses less digits than its factorization.

689694226818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29962.

The product of its digits is 143327232, while the sum is 69.

The spelling of 689694226818 in words is "six hundred eighty-nine billion, six hundred ninety-four million, two hundred twenty-six thousand, eight hundred eighteen".