1215316205999 has 24 divisors (see below), whose sum is σ = 1444237786368. Its totient is φ = 1019236994160.

The previous prime is 1215316205993. The next prime is 1215316206001. The reversal of 1215316205999 is 9995026135121.

It is a de Polignac number, because none of the positive numbers 2^k-1215316205999 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1215316205999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215316205993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7964192 + ... + 8115354.

It is an arithmetic number, because the mean of its divisors is an integer number (60176574432).

Almost surely, 2^{1215316205999} is an apocalyptic number.

1215316205999 is a deficient number, since it is larger than the sum of its proper divisors (228921580369).

1215316205999 is a wasteful number, since it uses less digits than its factorization.

1215316205999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154715 (or 154708 counting only the distinct ones).

The product of its (nonzero) digits is 1312200, while the sum is 53.

The spelling of 1215316205999 in words is "one trillion, two hundred fifteen billion, three hundred sixteen million, two hundred five thousand, nine hundred ninety-nine".