688665172216 has 32 divisors (see below), whose sum is σ = 1526597676000. Its totient is φ = 284964898176.

The previous prime is 688665172211. The next prime is 688665172229. The reversal of 688665172216 is 612271566886.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688665172211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212025831 + ... + 212029078.

It is an arithmetic number, because the mean of its divisors is an integer number (47706177375).

Almost surely, 2^688665172216 is an apocalyptic number.

It is an amenable number.

688665172216 is an abundant number, since it is smaller than the sum of its proper divisors (837932503784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

688665172216 is a wasteful number, since it uses less digits than its factorization.

688665172216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424054951 (or 424054947 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 58.

The spelling of 688665172216 in words is "six hundred eighty-eight billion, six hundred sixty-five million, one hundred seventy-two thousand, two hundred sixteen".