11517157856 has 24 divisors (see below), whose sum is σ = 22801088520. Its totient is φ = 5726405248.

The previous prime is 11517157853. The next prime is 11517157867. The reversal of 11517157856 is 65875171511.

It is a self number, because there is not a number n which added to its sum of digits gives 11517157856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11517157853) 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, 999611 + ... + 1011066.

It is an arithmetic number, because the mean of its divisors is an integer number (950045355).

Almost surely, 2^11517157856 is an apocalyptic number.

11517157856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11517157856 is a deficient number, since it is larger than the sum of its proper divisors (11283930664).

11517157856 is a wasteful number, since it uses less digits than its factorization.

11517157856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2010866 (or 2010858 counting only the distinct ones).

The product of its digits is 294000, while the sum is 47.

The spelling of 11517157856 in words is "eleven billion, five hundred seventeen million, one hundred fifty-seven thousand, eight hundred fifty-six".