918218188191 has 4 divisors (see below), whose sum is σ = 1224290917592. Its totient is φ = 612145458792.

The previous prime is 918218188133. The next prime is 918218188219. The reversal of 918218188191 is 191881812819.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191881812819 = 3 ⋅63960604273.

It is not a de Polignac number, because 918218188191 - 2¹³ = 918218179999 is a prime.

It is a super-2 number, since 2×918218188191² (a number of 25 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 (918218188891) 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, 153036364696 + ... + 153036364701.

It is an arithmetic number, because the mean of its divisors is an integer number (306072729398).

Almost surely, 2^918218188191 is an apocalyptic number.

918218188191 is a deficient number, since it is larger than the sum of its proper divisors (306072729401).

918218188191 is a wasteful number, since it uses less digits than its factorization.

918218188191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306072729400.

The product of its digits is 663552, while the sum is 57.

The spelling of 918218188191 in words is "nine hundred eighteen billion, two hundred eighteen million, one hundred eighty-eight thousand, one hundred ninety-one".