77609919727 has 2 divisors, whose sum is σ = 77609919728. Its totient is φ = 77609919726.

The previous prime is 77609919721. The next prime is 77609919773. The reversal of 77609919727 is 72791990677.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77609919727 - 2³ = 77609919719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77609919721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38804959863 + 38804959864.

It is an arithmetic number, because the mean of its divisors is an integer number (38804959864).

Almost surely, 2^77609919727 is an apocalyptic number.

77609919727 is a deficient number, since it is larger than the sum of its proper divisors (1).

77609919727 is an equidigital number, since it uses as much as digits as its factorization.

77609919727 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21003948, while the sum is 64.

The spelling of 77609919727 in words is "seventy-seven billion, six hundred nine million, nine hundred nineteen thousand, seven hundred twenty-seven".