77561060761 has 2 divisors, whose sum is σ = 77561060762. Its totient is φ = 77561060760.

The previous prime is 77561060743. The next prime is 77561060833. The reversal of 77561060761 is 16706016577.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77195065600 + 365995161 = 277840^2 + 19131^2 .

It is a cyclic number.

It is not a de Polignac number, because 77561060761 - 2¹¹ = 77561058713 is a prime.

It is not a weakly prime, because it can be changed into another prime (77561060261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38780530380 + 38780530381.

It is an arithmetic number, because the mean of its divisors is an integer number (38780530381).

Almost surely, 2^77561060761 is an apocalyptic number.

It is an amenable number.

77561060761 is a deficient number, since it is larger than the sum of its proper divisors (1).

77561060761 is an equidigital number, since it uses as much as digits as its factorization.

77561060761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 370440, while the sum is 46.

The spelling of 77561060761 in words is "seventy-seven billion, five hundred sixty-one million, sixty thousand, seven hundred sixty-one".