78799228469677 has 2 divisors, whose sum is σ = 78799228469678. Its totient is φ = 78799228469676.

The previous prime is 78799228469623. The next prime is 78799228469771. The reversal of 78799228469677 is 77696482299787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56260035447561 + 22539193022116 = 7500669^2 + 4747546^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78799228469677 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78799228469591 and 78799228469600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78799228467677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39399614234838 + 39399614234839.

It is an arithmetic number, because the mean of its divisors is an integer number (39399614234839).

Almost surely, 2^{78799228469677} is an apocalyptic number.

It is an amenable number.

78799228469677 is a deficient number, since it is larger than the sum of its proper divisors (1).

78799228469677 is an equidigital number, since it uses as much as digits as its factorization.

78799228469677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64524128256, while the sum is 91.

The spelling of 78799228469677 in words is "seventy-eight trillion, seven hundred ninety-nine billion, two hundred twenty-eight million, four hundred sixty-nine thousand, six hundred seventy-seven".