77042343761 has 2 divisors, whose sum is σ = 77042343762. Its totient is φ = 77042343760.

The previous prime is 77042343733. The next prime is 77042343767. The reversal of 77042343761 is 16734324077.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63031123600 + 14011220161 = 251060^2 + 118369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77042343761 is a prime.

It is not a weakly prime, because it can be changed into another prime (77042343767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38521171880 + 38521171881.

It is an arithmetic number, because the mean of its divisors is an integer number (38521171881).

Almost surely, 2^77042343761 is an apocalyptic number.

It is an amenable number.

77042343761 is a deficient number, since it is larger than the sum of its proper divisors (1).

77042343761 is an equidigital number, since it uses as much as digits as its factorization.

77042343761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 592704, while the sum is 44.

The spelling of 77042343761 in words is "seventy-seven billion, forty-two million, three hundred forty-three thousand, seven hundred sixty-one".