11861686799 has 4 divisors (see below), whose sum is σ = 12377412336. Its totient is φ = 11345961264.

The previous prime is 11861686789. The next prime is 11861686813. The reversal of 11861686799 is 99768616811.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11861686799 is a prime.

It is a super-2 number, since 2×11861686799² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11861686789) 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, 257862734 + ... + 257862779.

It is an arithmetic number, because the mean of its divisors is an integer number (3094353084).

Almost surely, 2^11861686799 is an apocalyptic number.

11861686799 is a deficient number, since it is larger than the sum of its proper divisors (515725537).

11861686799 is an equidigital number, since it uses as much as digits as its factorization.

11861686799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515725536.

The product of its digits is 7838208, while the sum is 62.

The spelling of 11861686799 in words is "eleven billion, eight hundred sixty-one million, six hundred eighty-six thousand, seven hundred ninety-nine".