11523515164015 has 4 divisors (see below), whose sum is σ = 13828218196824. Its totient is φ = 9218812131208.

The previous prime is 11523515163997. The next prime is 11523515164067. The reversal of 11523515164015 is 51046151532511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11523515164015 - 2³⁵ = 11489155425647 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1152351516397 + ... + 1152351516406.

It is an arithmetic number, because the mean of its divisors is an integer number (3457054549206).

Almost surely, 2^{11523515164015} is an apocalyptic number.

11523515164015 is a deficient number, since it is larger than the sum of its proper divisors (2304703032809).

11523515164015 is an equidigital number, since it uses as much as digits as its factorization.

11523515164015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2304703032808.

The product of its (nonzero) digits is 90000, while the sum is 40.

Adding to 11523515164015 its reverse (51046151532511), we get a palindrome (62569666696526).

The spelling of 11523515164015 in words is "eleven trillion, five hundred twenty-three billion, five hundred fifteen million, one hundred sixty-four thousand, fifteen".