18844396197 has 16 divisors (see below), whose sum is σ = 27446957568. Its totient is φ = 11405460080.

The previous prime is 18844396183. The next prime is 18844396211. The reversal of 18844396197 is 79169344881.

It is an interprime number because it is at equal distance from previous prime (18844396183) and next prime (18844396211).

It is a cyclic number.

It is not a de Polignac number, because 18844396197 - 2¹⁰ = 18844395173 is a prime.

It is a super-2 number, since 2×18844396197² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18844396197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18844396177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 359763 + ... + 408800.

It is an arithmetic number, because the mean of its divisors is an integer number (1715434848).

Almost surely, 2^18844396197 is an apocalyptic number.

It is an amenable number.

18844396197 is a deficient number, since it is larger than the sum of its proper divisors (8602561371).

18844396197 is a wasteful number, since it uses less digits than its factorization.

18844396197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769320.

The product of its digits is 10450944, while the sum is 60.

The spelling of 18844396197 in words is "eighteen billion, eight hundred forty-four million, three hundred ninety-six thousand, one hundred ninety-seven".