77927840647 has 2 divisors, whose sum is σ = 77927840648. Its totient is φ = 77927840646.

The previous prime is 77927840603. The next prime is 77927840657. The reversal of 77927840647 is 74604872977.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77927840647 - 2³¹ = 75780356999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77927840657) 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, 38963920323 + 38963920324.

It is an arithmetic number, because the mean of its divisors is an integer number (38963920324).

Almost surely, 2^77927840647 is an apocalyptic number.

77927840647 is a deficient number, since it is larger than the sum of its proper divisors (1).

77927840647 is an equidigital number, since it uses as much as digits as its factorization.

77927840647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33191424, while the sum is 61.

The spelling of 77927840647 in words is "seventy-seven billion, nine hundred twenty-seven million, eight hundred forty thousand, six hundred forty-seven".