11556707720 has 64 divisors (see below), whose sum is σ = 26704747440. Its totient is φ = 4498432000.

The previous prime is 11556707711. The next prime is 11556707737. The reversal of 11556707720 is 2770765511.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 6832344964 + 4724362756 = 82658^2 + 68734^2 .

It is a Harshad number since it is a multiple of its sum of digits (41).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 648854 + ... + 666426.

Almost surely, 2^11556707720 is an apocalyptic number.

11556707720 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 11556707720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13352373720).

11556707720 is an abundant number, since it is smaller than the sum of its proper divisors (15148039720).

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

11556707720 is a wasteful number, since it uses less digits than its factorization.

11556707720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18026 (or 18022 counting only the distinct ones).

The product of its (nonzero) digits is 102900, while the sum is 41.

The spelling of 11556707720 in words is "eleven billion, five hundred fifty-six million, seven hundred seven thousand, seven hundred twenty".