11851865817 has 8 divisors (see below), whose sum is σ = 17239077600. Its totient is φ = 7182948960.

The previous prime is 11851865813. The next prime is 11851865821. The reversal of 11851865817 is 71856815811.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11851865813) and next prime (11851865821).

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

It is not a de Polignac number, because 11851865817 - 2² = 11851865813 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 11851865817.

It is not an unprimeable number, because it can be changed into a prime (11851865813) 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, 179573692 + ... + 179573757.

It is an arithmetic number, because the mean of its divisors is an integer number (2154884700).

Almost surely, 2^11851865817 is an apocalyptic number.

It is an amenable number.

11851865817 is a deficient number, since it is larger than the sum of its proper divisors (5387211783).

11851865817 is a wasteful number, since it uses less digits than its factorization.

11851865817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359147463.

The product of its digits is 537600, while the sum is 51.

The spelling of 11851865817 in words is "eleven billion, eight hundred fifty-one million, eight hundred sixty-five thousand, eight hundred seventeen".