11817654845 has 4 divisors (see below), whose sum is σ = 14181185820. Its totient is φ = 9454123872.

The previous prime is 11817654829. The next prime is 11817654851. The reversal of 11817654845 is 54845671811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54845671811 = 7 ⋅7835095973.

It can be written as a sum of positive squares in 2 ways, for example, as 2859789529 + 8957865316 = 53477^2 + 94646^2 .

It is a cyclic number.

It is not a de Polignac number, because 11817654845 - 2⁴ = 11817654829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11817654793 and 11817654802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1181765480 + ... + 1181765489.

It is an arithmetic number, because the mean of its divisors is an integer number (3545296455).

Almost surely, 2^11817654845 is an apocalyptic number.

It is an amenable number.

11817654845 is a deficient number, since it is larger than the sum of its proper divisors (2363530975).

11817654845 is an equidigital number, since it uses as much as digits as its factorization.

11817654845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2363530974.

The product of its digits is 1075200, while the sum is 50.

The spelling of 11817654845 in words is "eleven billion, eight hundred seventeen million, six hundred fifty-four thousand, eight hundred forty-five".