781768451413 has 2 divisors, whose sum is σ = 781768451414. Its totient is φ = 781768451412.

The previous prime is 781768451407. The next prime is 781768451467. The reversal of 781768451413 is 314154867187.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 605038176964 + 176730274449 = 777842^2 + 420393^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-781768451413 is a prime.

It is a super-3 number, since 3×781768451413³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (781768458413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390884225706 + 390884225707.

It is an arithmetic number, because the mean of its divisors is an integer number (390884225707).

Almost surely, 2^781768451413 is an apocalyptic number.

It is an amenable number.

781768451413 is a deficient number, since it is larger than the sum of its proper divisors (1).

781768451413 is an equidigital number, since it uses as much as digits as its factorization.

781768451413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4515840, while the sum is 55.

The spelling of 781768451413 in words is "seven hundred eighty-one billion, seven hundred sixty-eight million, four hundred fifty-one thousand, four hundred thirteen".