688188551 has 2 divisors, whose sum is σ = 688188552. Its totient is φ = 688188550.

The previous prime is 688188541. The next prime is 688188559. The reversal of 688188551 is 155881886.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 688188551 - 2¹⁰ = 688187527 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 688188551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688188559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344094275 + 344094276.

It is an arithmetic number, because the mean of its divisors is an integer number (344094276).

Almost surely, 2^688188551 is an apocalyptic number.

688188551 is a deficient number, since it is larger than the sum of its proper divisors (1).

688188551 is an equidigital number, since it uses as much as digits as its factorization.

688188551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 614400, while the sum is 50.

The square root of 688188551 is about 26233.3480707286. The cubic root of 688188551 is about 882.8816309605.

The spelling of 688188551 in words is "six hundred eighty-eight million, one hundred eighty-eight thousand, five hundred fifty-one".