1867121798393 has 2 divisors, whose sum is σ = 1867121798394. Its totient is φ = 1867121798392.

The previous prime is 1867121798387. The next prime is 1867121798431. The reversal of 1867121798393 is 3938971217681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1487651014249 + 379470784144 = 1219693^2 + 616012^2 .

It is a cyclic number.

It is not a de Polignac number, because 1867121798393 - 2¹⁶ = 1867121732857 is a prime.

It is a super-2 number, since 2×1867121798393² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1867121798303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933560899196 + 933560899197.

It is an arithmetic number, because the mean of its divisors is an integer number (933560899197).

Almost surely, 2^{1867121798393} is an apocalyptic number.

It is an amenable number.

1867121798393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1867121798393 is an equidigital number, since it uses as much as digits as its factorization.

1867121798393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27433728, while the sum is 65.

The spelling of 1867121798393 in words is "one trillion, eight hundred sixty-seven billion, one hundred twenty-one million, seven hundred ninety-eight thousand, three hundred ninety-three".