688091879466 has 24 divisors (see below), whose sum is σ = 1491226971780. Its totient is φ = 229308385536.

The previous prime is 688091879429. The next prime is 688091879479. The reversal of 688091879466 is 664978190886.

688091879466 is a `hidden beast` number, since 6 + 8 + 8 + 0 + 91 + 8 + 79 + 466 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 585064361025 + 103027518441 = 764895^2 + 320979^2 .

It is a junction number, because it is equal to n+sod(n) for n = 688091879394 and 688091879403.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4554805 + ... + 4703448.

Almost surely, 2^688091879466 is an apocalyptic number.

688091879466 is an abundant number, since it is smaller than the sum of its proper divisors (803135092314).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

688091879466 is a wasteful number, since it uses less digits than its factorization.

688091879466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9262390 (or 9262387 counting only the distinct ones).

The product of its (nonzero) digits is 250822656, while the sum is 72.

The spelling of 688091879466 in words is "six hundred eighty-eight billion, ninety-one million, eight hundred seventy-nine thousand, four hundred sixty-six".