688994138927 has 2 divisors, whose sum is σ = 688994138928. Its totient is φ = 688994138926.

The previous prime is 688994138867. The next prime is 688994138929. The reversal of 688994138927 is 729831499886.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 688994138927 - 2⁸ = 688994138671 is a prime.

It is a super-2 number, since 2×688994138927² (a number of 24 digits) contains 22 as substring.

Together with 688994138929, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688994138929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344497069463 + 344497069464.

It is an arithmetic number, because the mean of its divisors is an integer number (344497069464).

Almost surely, 2^688994138927 is an apocalyptic number.

688994138927 is a deficient number, since it is larger than the sum of its proper divisors (1).

688994138927 is an equidigital number, since it uses as much as digits as its factorization.

688994138927 is an evil number, because the sum of its binary digits is even.

The product of its digits is 376233984, while the sum is 74.

The spelling of 688994138927 in words is "six hundred eighty-eight billion, nine hundred ninety-four million, one hundred thirty-eight thousand, nine hundred twenty-seven".