688568690219 has 4 divisors (see below), whose sum is σ = 689040637320. Its totient is φ = 688096743120.

The previous prime is 688568690189. The next prime is 688568690263. The reversal of 688568690219 is 912096865886.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688568690219 is a prime.

It is a super-2 number, since 2×688568690219² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688568690269) 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, 235971362 + ... + 235974279.

It is an arithmetic number, because the mean of its divisors is an integer number (172260159330).

Almost surely, 2^688568690219 is an apocalyptic number.

688568690219 is a deficient number, since it is larger than the sum of its proper divisors (471947101).

688568690219 is a wasteful number, since it uses less digits than its factorization.

688568690219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471947100.

The product of its (nonzero) digits is 89579520, while the sum is 68.

The spelling of 688568690219 in words is "six hundred eighty-eight billion, five hundred sixty-eight million, six hundred ninety thousand, two hundred nineteen".