1868851718869 has 2 divisors, whose sum is σ = 1868851718870. Its totient is φ = 1868851718868.

The previous prime is 1868851718849. The next prime is 1868851718887. The reversal of 1868851718869 is 9688171588681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1863265950225 + 5585768644 = 1365015^2 + 74738^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1868851718869 is a prime.

It is a super-2 number, since 2×1868851718869² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1868851718795 and 1868851718804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1868851718849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 934425859434 + 934425859435.

It is an arithmetic number, because the mean of its divisors is an integer number (934425859435).

Almost surely, 2^{1868851718869} is an apocalyptic number.

It is an amenable number.

1868851718869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1868851718869 is an equidigital number, since it uses as much as digits as its factorization.

1868851718869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 371589120, while the sum is 76.

The spelling of 1868851718869 in words is "one trillion, eight hundred sixty-eight billion, eight hundred fifty-one million, seven hundred eighteen thousand, eight hundred sixty-nine".