42768512777 has 2 divisors, whose sum is σ = 42768512778. Its totient is φ = 42768512776.

The previous prime is 42768512687. The next prime is 42768512797. The reversal of 42768512777 is 77721586724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40327065856 + 2441446921 = 200816^2 + 49411^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42768512777 is a prime.

It is not a weakly prime, because it can be changed into another prime (42768512797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21384256388 + 21384256389.

It is an arithmetic number, because the mean of its divisors is an integer number (21384256389).

Almost surely, 2^42768512777 is an apocalyptic number.

It is an amenable number.

42768512777 is a deficient number, since it is larger than the sum of its proper divisors (1).

42768512777 is an equidigital number, since it uses as much as digits as its factorization.

42768512777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9219840, while the sum is 56.

The spelling of 42768512777 in words is "forty-two billion, seven hundred sixty-eight million, five hundred twelve thousand, seven hundred seventy-seven".