11517278523 has 8 divisors (see below), whose sum is σ = 15369036048. Its totient is φ = 7671853344.

The previous prime is 11517278501. The next prime is 11517278533. The reversal of 11517278523 is 32587271511.

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

It is not a de Polignac number, because 11517278523 - 2⁵ = 11517278491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11517278533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1578840 + ... + 1586117.

It is an arithmetic number, because the mean of its divisors is an integer number (1921129506).

Almost surely, 2^11517278523 is an apocalyptic number.

11517278523 is a deficient number, since it is larger than the sum of its proper divisors (3851757525).

11517278523 is a wasteful number, since it uses less digits than its factorization.

11517278523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3166173.

The product of its digits is 117600, while the sum is 42.

The spelling of 11517278523 in words is "eleven billion, five hundred seventeen million, two hundred seventy-eight thousand, five hundred twenty-three".