688700645852 has 6 divisors (see below), whose sum is σ = 1205226130248. Its totient is φ = 344350322924.

The previous prime is 688700645819. The next prime is 688700645911. The reversal of 688700645852 is 258546007886.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 688700645791 and 688700645800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86087580728 + ... + 86087580735.

It is an arithmetic number, because the mean of its divisors is an integer number (200871021708).

Almost surely, 2^688700645852 is an apocalyptic number.

It is an amenable number.

688700645852 is a deficient number, since it is larger than the sum of its proper divisors (516525484396).

688700645852 is a wasteful number, since it uses less digits than its factorization.

688700645852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172175161467 (or 172175161465 counting only the distinct ones).

The product of its (nonzero) digits is 25804800, while the sum is 59.

The spelling of 688700645852 in words is "six hundred eighty-eight billion, seven hundred million, six hundred forty-five thousand, eight hundred fifty-two".