11527221780 has 120 divisors (see below), whose sum is σ = 36188718720. Its totient is φ = 3071597760.

The previous prime is 11527221751. The next prime is 11527221781. The reversal of 11527221780 is 8712272511.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11527221781) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3742281 + ... + 3745359.

It is an arithmetic number, because the mean of its divisors is an integer number (301572656).

Almost surely, 2^11527221780 is an apocalyptic number.

11527221780 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 11527221780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18094359360).

11527221780 is an abundant number, since it is smaller than the sum of its proper divisors (24661496940).

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

11527221780 is a wasteful number, since it uses less digits than its factorization.

11527221780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5411 (or 5400 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 36.

The spelling of 11527221780 in words is "eleven billion, five hundred twenty-seven million, two hundred twenty-one thousand, seven hundred eighty".