12145520000 has 160 divisors (see below), whose sum is σ = 30459562320. Its totient is φ = 4822272000.

The previous prime is 12145519999. The next prime is 12145520003. The reversal of 12145520000 is 2554121.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12145520003) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 12559517 + ... + 12560483.

Almost surely, 2^12145520000 is an apocalyptic number.

12145520000 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 12145520000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15229781160).

12145520000 is an abundant number, since it is smaller than the sum of its proper divisors (18314042320).

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

12145520000 is an frugal number, since it uses more digits than its factorization.

12145520000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158 (or 1131 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The spelling of 12145520000 in words is "twelve billion, one hundred forty-five million, five hundred twenty thousand".