11515534523 has 4 divisors (see below), whose sum is σ = 11570110728. Its totient is φ = 11460958320.

The previous prime is 11515534519. The next prime is 11515534543. The reversal of 11515534523 is 32543551511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32543551511 = 1993 ⋅16328927.

It is a cyclic number.

It is not a de Polignac number, because 11515534523 - 2² = 11515534519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11515534543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27287786 + ... + 27288207.

It is an arithmetic number, because the mean of its divisors is an integer number (2892527682).

Almost surely, 2^11515534523 is an apocalyptic number.

11515534523 is a deficient number, since it is larger than the sum of its proper divisors (54576205).

11515534523 is an equidigital number, since it uses as much as digits as its factorization.

11515534523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54576204.

The product of its digits is 45000, while the sum is 35.

The spelling of 11515534523 in words is "eleven billion, five hundred fifteen million, five hundred thirty-four thousand, five hundred twenty-three".