1918022794817 has 2 divisors, whose sum is σ = 1918022794818. Its totient is φ = 1918022794816.

The previous prime is 1918022794783. The next prime is 1918022794819. The reversal of 1918022794817 is 7184972208191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1757310804496 + 160711990321 = 1325636^2 + 400889^2 .

It is an emirp because it is prime and its reverse (7184972208191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1918022794817 - 2²⁸ = 1917754359361 is a prime.

It is a super-2 number, since 2×1918022794817² (a number of 25 digits) contains 22 as substring.

Together with 1918022794819, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1918022794819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959011397408 + 959011397409.

It is an arithmetic number, because the mean of its divisors is an integer number (959011397409).

Almost surely, 2^{1918022794817} is an apocalyptic number.

It is an amenable number.

1918022794817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918022794817 is an equidigital number, since it uses as much as digits as its factorization.

1918022794817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4064256, while the sum is 59.

The spelling of 1918022794817 in words is "one trillion, nine hundred eighteen billion, twenty-two million, seven hundred ninety-four thousand, eight hundred seventeen".