11881451520 has 208 divisors, whose sum is σ = 42241969920. Its totient is φ = 3168239616.

The previous prime is 11881451489. The next prime is 11881451531. The reversal of 11881451520 is 2515418811.

11881451520 is a `hidden beast` number, since 1 + 1 + 8 + 81 + 4 + 51 + 520 = 666.

It is a super-2 number, since 2×11881451520² (a number of 21 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 542217 + ... + 563703.

Almost surely, 2^11881451520 is an apocalyptic number.

11881451520 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 11881451520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21120984960).

11881451520 is an abundant number, since it is smaller than the sum of its proper divisors (30360518400).

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

11881451520 is an equidigital number, since it uses as much as digits as its factorization.

11881451520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21525 (or 21497 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 36.

The spelling of 11881451520 in words is "eleven billion, eight hundred eighty-one million, four hundred fifty-one thousand, five hundred twenty".