775605279121 has 2 divisors, whose sum is σ = 775605279122. Its totient is φ = 775605279120.

The previous prime is 775605279109. The next prime is 775605279143. The reversal of 775605279121 is 121972506577.

775605279121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 554645115025 + 220960164096 = 744745^2 + 470064^2 .

It is a cyclic number.

It is not a de Polignac number, because 775605279121 - 2¹⁷ = 775605148049 is a prime.

It is not a weakly prime, because it can be changed into another prime (775605219121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387802639560 + 387802639561.

It is an arithmetic number, because the mean of its divisors is an integer number (387802639561).

Almost surely, 2^775605279121 is an apocalyptic number.

It is an amenable number.

775605279121 is a deficient number, since it is larger than the sum of its proper divisors (1).

775605279121 is an equidigital number, since it uses as much as digits as its factorization.

775605279121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1852200, while the sum is 52.

The spelling of 775605279121 in words is "seven hundred seventy-five billion, six hundred five million, two hundred seventy-nine thousand, one hundred twenty-one".