1215134566565 has 8 divisors (see below), whose sum is σ = 1458182880288. Its totient is φ = 972093386320.

The previous prime is 1215134566559. The next prime is 1215134566609. The reversal of 1215134566565 is 5656654315121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1215134566565 - 2¹⁶ = 1215134501029 is a prime.

It is a super-2 number, since 2×1215134566565² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1401167 + ... + 2096076.

It is an arithmetic number, because the mean of its divisors is an integer number (182272860036).

Almost surely, 2^{1215134566565} is an apocalyptic number.

It is an amenable number.

1215134566565 is a deficient number, since it is larger than the sum of its proper divisors (243048313723).

1215134566565 is an equidigital number, since it uses as much as digits as its factorization.

1215134566565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3566739.

The product of its digits is 3240000, while the sum is 50.

The spelling of 1215134566565 in words is "one trillion, two hundred fifteen billion, one hundred thirty-four million, five hundred sixty-six thousand, five hundred sixty-five".