11666400320 has 112 divisors (see below), whose sum is σ = 28288975680. Its totient is φ = 4581881856.

The previous prime is 11666400307. The next prime is 11666400323. The reversal of 11666400320 is 2300466611.

It is a happy number.

It is a super-2 number, since 2×11666400320² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11666400323) 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, 4593611 + ... + 4596149.

It is an arithmetic number, because the mean of its divisors is an integer number (252580140).

Almost surely, 2^11666400320 is an apocalyptic number.

11666400320 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 11666400320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14144487840).

11666400320 is an abundant number, since it is smaller than the sum of its proper divisors (16622575360).

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

11666400320 is a wasteful number, since it uses less digits than its factorization.

11666400320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2812 (or 2802 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

Adding to 11666400320 its reverse (2300466611), we get a palindrome (13966866931).

The spelling of 11666400320 in words is "eleven billion, six hundred sixty-six million, four hundred thousand, three hundred twenty".