6688216593 has 6 divisors (see below), whose sum is σ = 9660757314. Its totient is φ = 4458811056.

The previous prime is 6688216537. The next prime is 6688216597. The reversal of 6688216593 is 3956128866.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 5555019024 + 1133197569 = 74532^2 + 33663^2 .

It is not a de Polignac number, because 6688216593 - 2¹² = 6688212497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6688216597) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 371567580 + ... + 371567597.

It is an arithmetic number, because the mean of its divisors is an integer number (1610126219).

Almost surely, 2^6688216593 is an apocalyptic number.

It is an amenable number.

6688216593 is a deficient number, since it is larger than the sum of its proper divisors (2972540721).

6688216593 is a wasteful number, since it uses less digits than its factorization.

6688216593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743135183 (or 743135180 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The square root of 6688216593 is about 81781.5174290622. The cubic root of 6688216593 is about 1884.0978023051.

The spelling of 6688216593 in words is "six billion, six hundred eighty-eight million, two hundred sixteen thousand, five hundred ninety-three".