18428949197 has 2 divisors, whose sum is σ = 18428949198. Its totient is φ = 18428949196.

The previous prime is 18428949193. The next prime is 18428949251. The reversal of 18428949197 is 79194982481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11073142441 + 7355806756 = 105229^2 + 85766^2 .

It is a cyclic number.

It is not a de Polignac number, because 18428949197 - 2² = 18428949193 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18428949191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9214474598 + 9214474599.

It is an arithmetic number, because the mean of its divisors is an integer number (9214474599).

Almost surely, 2^18428949197 is an apocalyptic number.

It is an amenable number.

18428949197 is a deficient number, since it is larger than the sum of its proper divisors (1).

18428949197 is an equidigital number, since it uses as much as digits as its factorization.

18428949197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 62.

The spelling of 18428949197 in words is "eighteen billion, four hundred twenty-eight million, nine hundred forty-nine thousand, one hundred ninety-seven".