12615205020 has 192 divisors, whose sum is σ = 39336579072. Its totient is φ = 2995200000.

The previous prime is 12615204997. The next prime is 12615205027. The reversal of 12615205020 is 2050251621.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12615205027) 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 63 ways as a sum of consecutive naturals, for example, 6465045 + ... + 6466995.

It is an arithmetic number, because the mean of its divisors is an integer number (204878016).

Almost surely, 2^12615205020 is an apocalyptic number.

12615205020 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 12615205020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19668289536).

12615205020 is an abundant number, since it is smaller than the sum of its proper divisors (26721374052).

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

12615205020 is a wasteful number, since it uses less digits than its factorization.

12615205020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2172 (or 2170 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 12615205020 its reverse (2050251621), we get a palindrome (14665456641).

The spelling of 12615205020 in words is "twelve billion, six hundred fifteen million, two hundred five thousand, twenty".