18672659197 has 2 divisors, whose sum is σ = 18672659198. Its totient is φ = 18672659196.

The previous prime is 18672659183. The next prime is 18672659219. The reversal of 18672659197 is 79195627681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14870826916 + 3801832281 = 121946^2 + 61659^2 .

It is an emirp because it is prime and its reverse (79195627681) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18672659197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18672659107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9336329598 + 9336329599.

It is an arithmetic number, because the mean of its divisors is an integer number (9336329599).

Almost surely, 2^18672659197 is an apocalyptic number.

It is an amenable number.

18672659197 is a deficient number, since it is larger than the sum of its proper divisors (1).

18672659197 is an equidigital number, since it uses as much as digits as its factorization.

18672659197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11430720, while the sum is 61.

The spelling of 18672659197 in words is "eighteen billion, six hundred seventy-two million, six hundred fifty-nine thousand, one hundred ninety-seven".