11005001280 has 448 divisors, whose sum is σ = 47785812480. Its totient is φ = 2321768448.

The previous prime is 11005001263. The next prime is 11005001297. The reversal of 11005001280 is 8210050011.

It is an interprime number because it is at equal distance from previous prime (11005001263) and next prime (11005001297).

It is a tau number, because it is divible by the number of its divisors (448).

It is a super-2 number, since 2×11005001280² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 779242 + ... + 793238.

It is an arithmetic number, because the mean of its divisors is an integer number (106664760).

Almost surely, 2^11005001280 is an apocalyptic number.

11005001280 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 11005001280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23892906240).

11005001280 is an abundant number, since it is smaller than the sum of its proper divisors (36780811200).

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

11005001280 is a wasteful number, since it uses less digits than its factorization.

11005001280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14043 (or 14027 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

Adding to 11005001280 its reverse (8210050011), we get a palindrome (19215051291).

The spelling of 11005001280 in words is "eleven billion, five million, one thousand, two hundred eighty".