778720133 has 2 divisors, whose sum is σ = 778720134. Its totient is φ = 778720132.

The previous prime is 778720123. The next prime is 778720141. The reversal of 778720133 is 331027877.

778720133 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., 728622049 + 50098084 = 26993^2 + 7078^2 .

It is a cyclic number.

It is not a de Polignac number, because 778720133 - 2⁶ = 778720069 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778720123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389360066 + 389360067.

It is an arithmetic number, because the mean of its divisors is an integer number (389360067).

Almost surely, 2^778720133 is an apocalyptic number.

It is an amenable number.

778720133 is a deficient number, since it is larger than the sum of its proper divisors (1).

778720133 is an equidigital number, since it uses as much as digits as its factorization.

778720133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49392, while the sum is 38.

The square root of 778720133 is about 27905.5573855818. The cubic root of 778720133 is about 920.0126545991.

The spelling of 778720133 in words is "seven hundred seventy-eight million, seven hundred twenty thousand, one hundred thirty-three".