688217449552 has 10 divisors (see below), whose sum is σ = 1333421308538. Its totient is φ = 344108724768.

The previous prime is 688217449499. The next prime is 688217449649. The reversal of 688217449552 is 255944712886.

It can be written as a sum of positive squares in only one way, i.e., 575619620416 + 112597829136 = 758696^2 + 335556^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 21506795283 + ... + 21506795314.

Almost surely, 2^688217449552 is an apocalyptic number.

It is an amenable number.

688217449552 is a deficient number, since it is larger than the sum of its proper divisors (645203858986).

688217449552 is a wasteful number, since it uses less digits than its factorization.

688217449552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43013590605 (or 43013590599 counting only the distinct ones).

The product of its digits is 38707200, while the sum is 61.

The spelling of 688217449552 in words is "six hundred eighty-eight billion, two hundred seventeen million, four hundred forty-nine thousand, five hundred fifty-two".