12503656064 has 64 divisors (see below), whose sum is σ = 25868505600. Its totient is φ = 6013608960.

The previous prime is 12503656063. The next prime is 12503656091. The reversal of 12503656064 is 46065630521.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (12503656063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 653222 + ... + 672090.

It is an arithmetic number, because the mean of its divisors is an integer number (404195400).

Almost surely, 2^12503656064 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 12503656064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12934252800).

12503656064 is an abundant number, since it is smaller than the sum of its proper divisors (13364849536).

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

12503656064 is a wasteful number, since it uses less digits than its factorization.

12503656064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19081 (or 19069 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 12503656064 in words is "twelve billion, five hundred three million, six hundred fifty-six thousand, sixty-four".