688818888819 has 12 divisors (see below), whose sum is σ = 1031811010776. Its totient is φ = 459212592384.

The previous prime is 688818888809. The next prime is 688818888859. The reversal of 688818888819 is 918888818886.

It is not a de Polignac number, because 688818888819 - 2¹⁶ = 688818823283 is a prime.

It is a super-2 number, since 2×688818888819² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is not an unprimeable number, because it can be changed into a prime (688818888809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1417322574 + ... + 1417323059.

It is an arithmetic number, because the mean of its divisors is an integer number (85984250898).

Almost surely, 2^688818888819 is an apocalyptic number.

688818888819 is a deficient number, since it is larger than the sum of its proper divisors (342992121957).

688818888819 is an equidigital number, since it uses as much as digits as its factorization.

688818888819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2834645648 (or 2834645636 counting only the distinct ones).

The product of its digits is 905969664, while the sum is 81.

The spelling of 688818888819 in words is "six hundred eighty-eight billion, eight hundred eighteen million, eight hundred eighty-eight thousand, eight hundred nineteen".