77775252647 has 2 divisors, whose sum is σ = 77775252648. Its totient is φ = 77775252646.

The previous prime is 77775252617. The next prime is 77775252661. The reversal of 77775252647 is 74625257777.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77775252647 - 2⁸ = 77775252391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77775252617) 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 as a sum of consecutive naturals, namely, 38887626323 + 38887626324.

It is an arithmetic number, because the mean of its divisors is an integer number (38887626324).

Almost surely, 2^77775252647 is an apocalyptic number.

77775252647 is a deficient number, since it is larger than the sum of its proper divisors (1).

77775252647 is an equidigital number, since it uses as much as digits as its factorization.

77775252647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40336800, while the sum is 59.

The spelling of 77775252647 in words is "seventy-seven billion, seven hundred seventy-five million, two hundred fifty-two thousand, six hundred forty-seven".