18889199550097 has 2 divisors, whose sum is σ = 18889199550098. Its totient is φ = 18889199550096.

The previous prime is 18889199550073. The next prime is 18889199550173. The reversal of 18889199550097 is 79005599198881.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9880611502336 + 9008588047761 = 3143344^2 + 3001431^2 .

It is a cyclic number.

It is not a de Polignac number, because 18889199550097 - 2³⁹ = 18339443736209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18889199549999 and 18889199550026.

It is not a weakly prime, because it can be changed into another prime (18889199550997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9444599775048 + 9444599775049.

It is an arithmetic number, because the mean of its divisors is an integer number (9444599775049).

Almost surely, 2^{18889199550097} is an apocalyptic number.

It is an amenable number.

18889199550097 is a deficient number, since it is larger than the sum of its proper divisors (1).

18889199550097 is an equidigital number, since it uses as much as digits as its factorization.

18889199550097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 587865600, while the sum is 79.

The spelling of 18889199550097 in words is "eighteen trillion, eight hundred eighty-nine billion, one hundred ninety-nine million, five hundred fifty thousand, ninety-seven".