777777061 has 2 divisors, whose sum is σ = 777777062. Its totient is φ = 777777060.

The previous prime is 777777043. The next prime is 777777227. The reversal of 777777061 is 160777777.

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., 744252961 + 33524100 = 27281^2 + 5790^2 .

It is an emirp because it is prime and its reverse (160777777) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-777777061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 777776996 and 777777014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (777477061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 388888530 + 388888531.

It is an arithmetic number, because the mean of its divisors is an integer number (388888531).

Almost surely, 2^777777061 is an apocalyptic number.

It is an amenable number.

777777061 is a deficient number, since it is larger than the sum of its proper divisors (1).

777777061 is an equidigital number, since it uses as much as digits as its factorization.

777777061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 705894, while the sum is 49.

The square root of 777777061 is about 27888.6547004333. The cubic root of 777777061 is about 919.6411096219.

The spelling of 777777061 in words is "seven hundred seventy-seven million, seven hundred seventy-seven thousand, sixty-one".