11565423402 has 48 divisors (see below), whose sum is σ = 25244513280. Its totient is φ = 3530532096.

The previous prime is 11565423349. The next prime is 11565423403. The reversal of 11565423402 is 20432456511.

11565423402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (11565423403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83874 + ... + 173682.

It is an arithmetic number, because the mean of its divisors is an integer number (525927360).

Almost surely, 2^11565423402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11565423402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12622256640).

11565423402 is an abundant number, since it is smaller than the sum of its proper divisors (13679089878).

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

11565423402 is a wasteful number, since it uses less digits than its factorization.

11565423402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89967 (or 89954 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 11565423402 its reverse (20432456511), we get a palindrome (31997879913).

The spelling of 11565423402 in words is "eleven billion, five hundred sixty-five million, four hundred twenty-three thousand, four hundred two".