781813183092449 has 2 divisors, whose sum is σ = 781813183092450. Its totient is φ = 781813183092448.

The previous prime is 781813183092401. The next prime is 781813183092451. The reversal of 781813183092449 is 944290381318187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 689946095580625 + 91867087511824 = 26266825^2 + 9584732^2 .

It is an emirp because it is prime and its reverse (944290381318187) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-781813183092449 is a prime.

It is a super-2 number, since 2×781813183092449² (a number of 31 digits) contains 22 as substring.

Together with 781813183092451, 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 (781813183092349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390906591546224 + 390906591546225.

It is an arithmetic number, because the mean of its divisors is an integer number (390906591546225).

Almost surely, 2^{781813183092449} is an apocalyptic number.

It is an amenable number.

781813183092449 is a deficient number, since it is larger than the sum of its proper divisors (1).

781813183092449 is an equidigital number, since it uses as much as digits as its factorization.

781813183092449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 83607552, while the sum is 68.

The spelling of 781813183092449 in words is "seven hundred eighty-one trillion, eight hundred thirteen billion, one hundred eighty-three million, ninety-two thousand, four hundred forty-nine".