18600000197 has 4 divisors (see below), whose sum is σ = 18628225440. Its totient is φ = 18571774956.

The previous prime is 18600000187. The next prime is 18600000241. The reversal of 18600000197 is 79100000681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79100000681 = 13 ⋅6084615437.

It is a cyclic number.

It is not a de Polignac number, because 18600000197 - 2³² = 14305032901 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 (18600000137) 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 3 ways as a sum of consecutive naturals, for example, 14111633 + ... + 14112950.

It is an arithmetic number, because the mean of its divisors is an integer number (4657056360).

Almost surely, 2^18600000197 is an apocalyptic number.

It is an amenable number.

18600000197 is a deficient number, since it is larger than the sum of its proper divisors (28225243).

18600000197 is an equidigital number, since it uses as much as digits as its factorization.

18600000197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28225242.

The product of its (nonzero) digits is 3024, while the sum is 32.

The spelling of 18600000197 in words is "eighteen billion, six hundred million, one hundred ninety-seven", and thus it is an aban number.