12005451520 has 72 divisors (see below), whose sum is σ = 29150963856. Its totient is φ = 4736360448.

The previous prime is 12005451517. The next prime is 12005451553. The reversal of 12005451520 is 2515450021.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29199 + ... + 157681.

It is an arithmetic number, because the mean of its divisors is an integer number (404874498).

Almost surely, 2^12005451520 is an apocalyptic number.

12005451520 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 12005451520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14575481928).

12005451520 is an abundant number, since it is smaller than the sum of its proper divisors (17145512336).

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

12005451520 is an equidigital number, since it uses as much as digits as its factorization.

12005451520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128577 (or 128563 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The spelling of 12005451520 in words is "twelve billion, five million, four hundred fifty-one thousand, five hundred twenty".