2115501601265 has 16 divisors (see below), whose sum is σ = 2745317836800. Its totient is φ = 1555680084672.

The previous prime is 2115501601231. The next prime is 2115501601267. The reversal of 2115501601265 is 5621061055112.

It is a cyclic number.

It is not a de Polignac number, because 2115501601265 - 2⁸ = 2115501601009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2115501601267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68072705 + ... + 68103774.

It is an arithmetic number, because the mean of its divisors is an integer number (171582364800).

Almost surely, 2^{2115501601265} is an apocalyptic number.

It is an amenable number.

2115501601265 is a deficient number, since it is larger than the sum of its proper divisors (629816235535).

2115501601265 is a wasteful number, since it uses less digits than its factorization.

2115501601265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136176736.

The product of its (nonzero) digits is 18000, while the sum is 35.

Adding to 2115501601265 its reverse (5621061055112), we get a palindrome (7736562656377).

The spelling of 2115501601265 in words is "two trillion, one hundred fifteen billion, five hundred one million, six hundred one thousand, two hundred sixty-five".