242776220777 has 4 divisors (see below), whose sum is σ = 243019728516. Its totient is φ = 242532713040.

The previous prime is 242776220767. The next prime is 242776220821. The reversal of 242776220777 is 777022677242.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 87523672336 + 155252548441 = 295844^2 + 394021^2 .

It is a cyclic number.

It is not a de Polignac number, because 242776220777 - 2⁸ = 242776220521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242776220767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121752374 + ... + 121754367.

It is an arithmetic number, because the mean of its divisors is an integer number (60754932129).

Almost surely, 2^242776220777 is an apocalyptic number.

It is an amenable number.

242776220777 is a deficient number, since it is larger than the sum of its proper divisors (243507739).

242776220777 is an equidigital number, since it uses as much as digits as its factorization.

242776220777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243507738.

The product of its (nonzero) digits is 6453888, while the sum is 53.

The spelling of 242776220777 in words is "two hundred forty-two billion, seven hundred seventy-six million, two hundred twenty thousand, seven hundred seventy-seven".