688661489487 has 16 divisors (see below), whose sum is σ = 922166477568. Its totient is φ = 457136300160.

The previous prime is 688661489473. The next prime is 688661489491. The reversal of 688661489487 is 784984166886.

It is not a de Polignac number, because 688661489487 - 2⁴ = 688661489471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688661489497) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126412 + ... + 1180382.

It is an arithmetic number, because the mean of its divisors is an integer number (57635404848).

Almost surely, 2^688661489487 is an apocalyptic number.

688661489487 is a deficient number, since it is larger than the sum of its proper divisors (233504988081).

688661489487 is a wasteful number, since it uses less digits than its factorization.

688661489487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054910.

The product of its digits is 891813888, while the sum is 75.

The spelling of 688661489487 in words is "six hundred eighty-eight billion, six hundred sixty-one million, four hundred eighty-nine thousand, four hundred eighty-seven".