688818888859 has 2 divisors, whose sum is σ = 688818888860. Its totient is φ = 688818888858.

The previous prime is 688818888809. The next prime is 688818888869. The reversal of 688818888859 is 958888818886.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 688818888859 - 2¹³ = 688818880667 is a prime.

It is not a weakly prime, because it can be changed into another prime (688818888809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344409444429 + 344409444430.

It is an arithmetic number, because the mean of its divisors is an integer number (344409444430).

Almost surely, 2^688818888859 is an apocalyptic number.

688818888859 is a deficient number, since it is larger than the sum of its proper divisors (1).

688818888859 is an equidigital number, since it uses as much as digits as its factorization.

688818888859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4529848320, while the sum is 85.

The spelling of 688818888859 in words is "six hundred eighty-eight billion, eight hundred eighteen million, eight hundred eighty-eight thousand, eight hundred fifty-nine".