778642842149 has 2 divisors, whose sum is σ = 778642842150. Its totient is φ = 778642842148.

The previous prime is 778642842137. The next prime is 778642842151. The reversal of 778642842149 is 941248246877.

778642842149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 685779421924 + 92863420225 = 828118^2 + 304735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-778642842149 is a prime.

Together with 778642842151, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 778642842091 and 778642842100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778642844149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389321421074 + 389321421075.

It is an arithmetic number, because the mean of its divisors is an integer number (389321421075).

Almost surely, 2^778642842149 is an apocalyptic number.

It is an amenable number.

778642842149 is a deficient number, since it is larger than the sum of its proper divisors (1).

778642842149 is an equidigital number, since it uses as much as digits as its factorization.

778642842149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43352064, while the sum is 62.

The spelling of 778642842149 in words is "seven hundred seventy-eight billion, six hundred forty-two million, eight hundred forty-two thousand, one hundred forty-nine".