11801326320 has 320 divisors, whose sum is σ = 47246976000. Its totient is φ = 2651526144.

The previous prime is 11801326291. The next prime is 11801326321. The reversal of 11801326320 is 2362310811.

It is a happy number.

11801326320 is a `hidden beast` number, since 1 + 18 + 0 + 1 + 326 + 320 = 666.

It is a super-2 number, since 2×11801326320² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11801326321) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 885466 + ... + 898694.

It is an arithmetic number, because the mean of its divisors is an integer number (147646800).

Almost surely, 2^11801326320 is an apocalyptic number.

11801326320 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 11801326320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23623488000).

11801326320 is an abundant number, since it is smaller than the sum of its proper divisors (35445649680).

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

11801326320 is a wasteful number, since it uses less digits than its factorization.

11801326320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13317 (or 13305 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 11801326320 in words is "eleven billion, eight hundred one million, three hundred twenty-six thousand, three hundred twenty".