1994022351817 has 2 divisors, whose sum is σ = 1994022351818. Its totient is φ = 1994022351816.

The previous prime is 1994022351809. The next prime is 1994022351821. The reversal of 1994022351817 is 7181532204991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1937786497936 + 56235853881 = 1392044^2 + 237141^2 .

It is a cyclic number.

It is not a de Polignac number, because 1994022351817 - 2³ = 1994022351809 is a prime.

It is a super-2 number, since 2×1994022351817² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1994022351877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997011175908 + 997011175909.

It is an arithmetic number, because the mean of its divisors is an integer number (997011175909).

Almost surely, 2^{1994022351817} is an apocalyptic number.

It is an amenable number.

1994022351817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994022351817 is an equidigital number, since it uses as much as digits as its factorization.

1994022351817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 1994022351817 in words is "one trillion, nine hundred ninety-four billion, twenty-two million, three hundred fifty-one thousand, eight hundred seventeen".