918689986819 has 16 divisors (see below), whose sum is σ = 1016523198720. Its totient is φ = 823247404000.

The previous prime is 918689986793. The next prime is 918689986843.

918689986819 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 918689986819 - 2⁵ = 918689986787 is a prime.

It is a super-2 number, since 2×918689986819² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (918689986519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3939264 + ... + 4165954.

It is an arithmetic number, because the mean of its divisors is an integer number (63532699920).

Almost surely, 2^918689986819 is an apocalyptic number.

918689986819 is a deficient number, since it is larger than the sum of its proper divisors (97833211901).

918689986819 is a wasteful number, since it uses less digits than its factorization.

918689986819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231962.

The product of its digits is 967458816, while the sum is 82.

The spelling of 918689986819 in words is "nine hundred eighteen billion, six hundred eighty-nine million, nine hundred eighty-six thousand, eight hundred nineteen".