1817691149863 has 2 divisors, whose sum is σ = 1817691149864. Its totient is φ = 1817691149862.

The previous prime is 1817691149767. The next prime is 1817691149893. The reversal of 1817691149863 is 3689411967181.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1817691149863 is a prime.

It is a super-2 number, since 2×1817691149863² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1817691149795 and 1817691149804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1817691149893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 908845574931 + 908845574932.

It is an arithmetic number, because the mean of its divisors is an integer number (908845574932).

Almost surely, 2^{1817691149863} is an apocalyptic number.

1817691149863 is a deficient number, since it is larger than the sum of its proper divisors (1).

1817691149863 is an equidigital number, since it uses as much as digits as its factorization.

1817691149863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15676416, while the sum is 64.

The spelling of 1817691149863 in words is "one trillion, eight hundred seventeen billion, six hundred ninety-one million, one hundred forty-nine thousand, eight hundred sixty-three".