786778274749 has 2 divisors, whose sum is σ = 786778274750. Its totient is φ = 786778274748.

The previous prime is 786778274747. The next prime is 786778274759. The reversal of 786778274749 is 947472877687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 744239212249 + 42539062500 = 862693^2 + 206250^2 .

It is a cyclic number.

It is not a de Polignac number, because 786778274749 - 2¹ = 786778274747 is a prime.

Together with 786778274747, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (786778274743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 393389137374 + 393389137375.

It is an arithmetic number, because the mean of its divisors is an integer number (393389137375).

Almost surely, 2^786778274749 is an apocalyptic number.

It is an amenable number.

786778274749 is a deficient number, since it is larger than the sum of its proper divisors (1).

786778274749 is an equidigital number, since it uses as much as digits as its factorization.

786778274749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1858719744, while the sum is 76.

The spelling of 786778274749 in words is "seven hundred eighty-six billion, seven hundred seventy-eight million, two hundred seventy-four thousand, seven hundred forty-nine".