78727959677 has 2 divisors, whose sum is σ = 78727959678. Its totient is φ = 78727959676.

The previous prime is 78727959601. The next prime is 78727959679. The reversal of 78727959677 is 77695972787.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78720086041 + 7873636 = 280571^2 + 2806^2 .

It is a cyclic number.

It is not a de Polignac number, because 78727959677 - 2⁸ = 78727959421 is a prime.

Together with 78727959679, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78727959679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39363979838 + 39363979839.

It is an arithmetic number, because the mean of its divisors is an integer number (39363979839).

Almost surely, 2^78727959677 is an apocalyptic number.

It is an amenable number.

78727959677 is a deficient number, since it is larger than the sum of its proper divisors (1).

78727959677 is an equidigital number, since it uses as much as digits as its factorization.

78727959677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653456160, while the sum is 74.

The spelling of 78727959677 in words is "seventy-eight billion, seven hundred twenty-seven million, nine hundred fifty-nine thousand, six hundred seventy-seven".