18420201746897 has 2 divisors, whose sum is σ = 18420201746898. Its totient is φ = 18420201746896.

The previous prime is 18420201746879. The next prime is 18420201746917. The reversal of 18420201746897 is 79864710202481.

Together with previous prime (18420201746879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17188909694401 + 1231292052496 = 4145951^2 + 1109636^2 .

It is an emirp because it is prime and its reverse (79864710202481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18420201746897 - 2⁸ = 18420201746641 is a prime.

It is not a weakly prime, because it can be changed into another prime (18420201646897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9210100873448 + 9210100873449.

It is an arithmetic number, because the mean of its divisors is an integer number (9210100873449).

Almost surely, 2^{18420201746897} is an apocalyptic number.

It is an amenable number.

18420201746897 is a deficient number, since it is larger than the sum of its proper divisors (1).

18420201746897 is an equidigital number, since it uses as much as digits as its factorization.

18420201746897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10838016, while the sum is 59.

The spelling of 18420201746897 in words is "eighteen trillion, four hundred twenty billion, two hundred one million, seven hundred forty-six thousand, eight hundred ninety-seven".