11515006505 has 4 divisors (see below), whose sum is σ = 13818007812. Its totient is φ = 9212005200.

The previous prime is 11515006427. The next prime is 11515006519. The reversal of 11515006505 is 50560051511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50560051511 = 9619 ⋅5256269.

It can be written as a sum of positive squares in 2 ways, for example, as 7051296784 + 4463709721 = 83972^2 + 66811^2 .

It is not a de Polignac number, because 11515006505 - 2²⁶ = 11447897641 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1151500646 + ... + 1151500655.

It is an arithmetic number, because the mean of its divisors is an integer number (3454501953).

Almost surely, 2^11515006505 is an apocalyptic number.

It is an amenable number.

11515006505 is a deficient number, since it is larger than the sum of its proper divisors (2303001307).

11515006505 is an equidigital number, since it uses as much as digits as its factorization.

11515006505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2303001306.

The product of its (nonzero) digits is 3750, while the sum is 29.

The spelling of 11515006505 in words is "eleven billion, five hundred fifteen million, six thousand, five hundred five".