1215587865000 has 160 divisors (see below), whose sum is σ = 3798553698720. Its totient is φ = 324066528000.

The previous prime is 1215587864947. The next prime is 1215587865001. The reversal of 1215587865000 is 5687855121.

It is not an unprimeable number, because it can be changed into a prime (1215587865001) 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 39 ways as a sum of consecutive naturals, for example, 67235962 + ... + 67254038.

It is an arithmetic number, because the mean of its divisors is an integer number (23740960617).

Almost surely, 2^{1215587865000} is an apocalyptic number.

1215587865000 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 1215587865000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1899276849360).

1215587865000 is an abundant number, since it is smaller than the sum of its proper divisors (2582965833720).

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

1215587865000 is a wasteful number, since it uses less digits than its factorization.

1215587865000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22589 (or 22570 counting only the distinct ones).

The product of its (nonzero) digits is 672000, while the sum is 48.

The spelling of 1215587865000 in words is "one trillion, two hundred fifteen billion, five hundred eighty-seven million, eight hundred sixty-five thousand".