11618817547 has 4 divisors (see below), whose sum is σ = 12230334280. Its totient is φ = 11007300816.

The previous prime is 11618817523. The next prime is 11618817593. The reversal of 11618817547 is 74571881611.

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 11618817547 - 2¹⁹ = 11618293259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11618817547.

It is not an unprimeable number, because it can be changed into a prime (11618812547) 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, 305758338 + ... + 305758375.

It is an arithmetic number, because the mean of its divisors is an integer number (3057583570).

Almost surely, 2^11618817547 is an apocalyptic number.

11618817547 is a deficient number, since it is larger than the sum of its proper divisors (611516733).

11618817547 is an equidigital number, since it uses as much as digits as its factorization.

11618817547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611516732.

The product of its digits is 376320, while the sum is 49.

The spelling of 11618817547 in words is "eleven billion, six hundred eighteen million, eight hundred seventeen thousand, five hundred forty-seven".