688951393887 has 16 divisors (see below), whose sum is σ = 922539518208. Its totient is φ = 457333785600.

The previous prime is 688951393883. The next prime is 688951393919. The reversal of 688951393887 is 788393159886.

It is not a de Polignac number, because 688951393887 - 2² = 688951393883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688951393883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1433887 + ... + 1853087.

It is an arithmetic number, because the mean of its divisors is an integer number (57658719888).

Almost surely, 2^688951393887 is an apocalyptic number.

688951393887 is a deficient number, since it is larger than the sum of its proper divisors (233588124321).

688951393887 is a wasteful number, since it uses less digits than its factorization.

688951393887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421550.

The product of its digits is 627056640, while the sum is 75.

The spelling of 688951393887 in words is "six hundred eighty-eight billion, nine hundred fifty-one million, three hundred ninety-three thousand, eight hundred eighty-seven".