11721642272 has 18 divisors (see below), whose sum is σ = 23078189043. Its totient is φ = 5860514912.

The previous prime is 11721642253. The next prime is 11721642299. The reversal of 11721642272 is 27224612711.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 5860821136 + 5860821136 = 76556^2 + 76556^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=76556.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 602879 + ... + 622017.

Almost surely, 2^11721642272 is an apocalyptic number.

It is an amenable number.

11721642272 is a deficient number, since it is larger than the sum of its proper divisors (11356546771).

11721642272 is an frugal number, since it uses more digits than its factorization.

11721642272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38288 (or 19141 counting only the distinct ones).

The product of its digits is 18816, while the sum is 35.

The spelling of 11721642272 in words is "eleven billion, seven hundred twenty-one million, six hundred forty-two thousand, two hundred seventy-two".