77708240173 has 2 divisors, whose sum is σ = 77708240174. Its totient is φ = 77708240172.

The previous prime is 77708240161. The next prime is 77708240249. The reversal of 77708240173 is 37104280777.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77410263529 + 297976644 = 278227^2 + 17262^2 .

It is a cyclic number.

It is not a de Polignac number, because 77708240173 - 2²⁵ = 77674685741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77708240153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38854120086 + 38854120087.

It is an arithmetic number, because the mean of its divisors is an integer number (38854120087).

Almost surely, 2^77708240173 is an apocalyptic number.

It is an amenable number.

77708240173 is a deficient number, since it is larger than the sum of its proper divisors (1).

77708240173 is an equidigital number, since it uses as much as digits as its factorization.

77708240173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 460992, while the sum is 46.

The spelling of 77708240173 in words is "seventy-seven billion, seven hundred eight million, two hundred forty thousand, one hundred seventy-three".