11706721720 has 64 divisors (see below), whose sum is σ = 26807760000. Its totient is φ = 4600192128.

The previous prime is 11706721717. The next prime is 11706721721. The reversal of 11706721720 is 2712760711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11706721721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 584431 + ... + 604129.

It is an arithmetic number, because the mean of its divisors is an integer number (418871250).

Almost surely, 2^11706721720 is an apocalyptic number.

11706721720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11706721720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13403880000).

11706721720 is an abundant number, since it is smaller than the sum of its proper divisors (15101038280).

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

11706721720 is a wasteful number, since it uses less digits than its factorization.

11706721720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19972 (or 19968 counting only the distinct ones).

The product of its (nonzero) digits is 8232, while the sum is 34.

The spelling of 11706721720 in words is "eleven billion, seven hundred six million, seven hundred twenty-one thousand, seven hundred twenty".