6647731722 has 80 divisors (see below), whose sum is σ = 15576010560. Its totient is φ = 2115134208.

The previous prime is 6647731691. The next prime is 6647731751. The reversal of 6647731722 is 2271377466.

6647731722 is a `hidden beast` number, since 6 + 6 + 477 + 3 + 172 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2096154 + ... + 2099322.

It is an arithmetic number, because the mean of its divisors is an integer number (194700132).

Almost surely, 2^6647731722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6647731722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7788005280).

6647731722 is an abundant number, since it is smaller than the sum of its proper divisors (8928278838).

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

6647731722 is a wasteful number, since it uses less digits than its factorization.

6647731722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3769 (or 3760 counting only the distinct ones).

The product of its digits is 592704, while the sum is 45.

The square root of 6647731722 is about 81533.6232605911. The cubic root of 6647731722 is about 1880.2885216233.

The spelling of 6647731722 in words is "six billion, six hundred forty-seven million, seven hundred thirty-one thousand, seven hundred twenty-two".