6665736722 has 6 divisors (see below), whose sum is σ = 9998778279. Its totient is φ = 3332810630.

The previous prime is 6665736713. The next prime is 6665736757. The reversal of 6665736722 is 2276375666.

It can be written as a sum of positive squares in only one way, i.e., 3332868361 + 3332868361 = 57731^2 + 57731^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=57731.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 86597 + ... + 144327.

Almost surely, 2^6665736722 is an apocalyptic number.

6665736722 is a deficient number, since it is larger than the sum of its proper divisors (3333041557).

6665736722 is an frugal number, since it uses more digits than its factorization.

6665736722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115464 (or 57733 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 50.

The square root of 6665736722 is about 81643.9631693612. The cubic root of 6665736722 is about 1881.9845425491.

Multiplying 6665736722 by its sum of digits (50), we get a square (333286836100 = 577310²).

The spelling of 6665736722 in words is "six billion, six hundred sixty-five million, seven hundred thirty-six thousand, seven hundred twenty-two".