688775044565434 has 8 divisors (see below), whose sum is σ = 1033186892136660. Its totient is φ = 344379413853216.

The previous prime is 688775044565429. The next prime is 688775044565441. The reversal of 688775044565434 is 434565440577886.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 683804352020409 + 4970692545025 = 26149653^2 + 2229505^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×688775044565434² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4054108569 + ... + 4054278460.

Almost surely, 2^{688775044565434} is an apocalyptic number.

688775044565434 is a deficient number, since it is larger than the sum of its proper divisors (344411847571226).

688775044565434 is a wasteful number, since it uses less digits than its factorization.

688775044565434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8108429504.

The product of its (nonzero) digits is 10838016000, while the sum is 76.

The spelling of 688775044565434 in words is "six hundred eighty-eight trillion, seven hundred seventy-five billion, forty-four million, five hundred sixty-five thousand, four hundred thirty-four".