688983389799 has 4 divisors (see below), whose sum is σ = 918644519736. Its totient is φ = 459322259864.

The previous prime is 688983389791. The next prime is 688983389803. The reversal of 688983389799 is 997983389886.

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 688983389799 - 2³ = 688983389791 is a prime.

It is a super-2 number, since 2×688983389799² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688983389791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114830564964 + ... + 114830564969.

It is an arithmetic number, because the mean of its divisors is an integer number (229661129934).

Almost surely, 2^688983389799 is an apocalyptic number.

688983389799 is a deficient number, since it is larger than the sum of its proper divisors (229661129937).

688983389799 is a wasteful number, since it uses less digits than its factorization.

688983389799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229661129936.

The product of its digits is 10158317568, while the sum is 87.

Adding to 688983389799 its sum of digits (87), we get a palindrome (688983389886).

The spelling of 688983389799 in words is "six hundred eighty-eight billion, nine hundred eighty-three million, three hundred eighty-nine thousand, seven hundred ninety-nine".