918363638191 has 4 divisors (see below), whose sum is σ = 932070558232. Its totient is φ = 904656718152.

The previous prime is 918363638167. The next prime is 918363638197. The reversal of 918363638191 is 191836363819.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191836363819 = 673 ⋅285046603.

It is a cyclic number.

It is not a de Polignac number, because 918363638191 - 2¹¹ = 918363636143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (918363638197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6853459920 + ... + 6853460053.

It is an arithmetic number, because the mean of its divisors is an integer number (233017639558).

Almost surely, 2^918363638191 is an apocalyptic number.

918363638191 is a deficient number, since it is larger than the sum of its proper divisors (13706920041).

918363638191 is a wasteful number, since it uses less digits than its factorization.

918363638191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13706920040.

The product of its digits is 5038848, while the sum is 58.

The spelling of 918363638191 in words is "nine hundred eighteen billion, three hundred sixty-three million, six hundred thirty-eight thousand, one hundred ninety-one".