12861880064 has 144 divisors (see below), whose sum is σ = 29603333760. Its totient is φ = 5515776000.

The previous prime is 12861880049. The next prime is 12861880079. The reversal of 12861880064 is 46008816821.

It is an interprime number because it is at equal distance from previous prime (12861880049) and next prime (12861880079).

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 12861879997 and 12861880024.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22524899 + ... + 22525469.

Almost surely, 2^12861880064 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 12861880064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14801666880).

12861880064 is an abundant number, since it is smaller than the sum of its proper divisors (16741453696).

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

12861880064 is a wasteful number, since it uses less digits than its factorization.

12861880064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038 (or 1024 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 44.

The spelling of 12861880064 in words is "twelve billion, eight hundred sixty-one million, eight hundred eighty thousand, sixty-four".