12013511552 has 64 divisors (see below), whose sum is σ = 27503679840. Its totient is φ = 5120133120.

The previous prime is 12013511509. The next prime is 12013511569. The reversal of 12013511552 is 25511531021.

It is a tau number, because it is divible by the number of its divisors (64).

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, 125138 + ... + 199214.

Almost surely, 2^12013511552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12013511552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13751839920).

12013511552 is an abundant number, since it is smaller than the sum of its proper divisors (15490168288).

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

12013511552 is an equidigital number, since it uses as much as digits as its factorization.

12013511552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74279 (or 74267 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 26.

The spelling of 12013511552 in words is "twelve billion, thirteen million, five hundred eleven thousand, five hundred fifty-two".