77775252617 has 2 divisors, whose sum is σ = 77775252618. Its totient is φ = 77775252616.

The previous prime is 77775252571. The next prime is 77775252647. The reversal of 77775252617 is 71625257777.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75905209081 + 1870043536 = 275509^2 + 43244^2 .

It is a cyclic number.

It is not a de Polignac number, because 77775252617 - 2²⁸ = 77506817161 is a prime.

It is not a weakly prime, because it can be changed into another prime (77775252647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38887626308 + 38887626309.

It is an arithmetic number, because the mean of its divisors is an integer number (38887626309).

Almost surely, 2^77775252617 is an apocalyptic number.

It is an amenable number.

77775252617 is a deficient number, since it is larger than the sum of its proper divisors (1).

77775252617 is an equidigital number, since it uses as much as digits as its factorization.

77775252617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10084200, while the sum is 56.

The spelling of 77775252617 in words is "seventy-seven billion, seven hundred seventy-five million, two hundred fifty-two thousand, six hundred seventeen".