78858560545657 has 2 divisors, whose sum is σ = 78858560545658. Its totient is φ = 78858560545656.

The previous prime is 78858560545619. The next prime is 78858560545759. The reversal of 78858560545657 is 75654506585887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77225797928041 + 1632762617616 = 8787821^2 + 1277796^2 .

It is an emirp because it is prime and its reverse (75654506585887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78858560545657 - 2⁷ = 78858560545529 is a prime.

It is not a weakly prime, because it can be changed into another prime (78858560545607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39429280272828 + 39429280272829.

It is an arithmetic number, because the mean of its divisors is an integer number (39429280272829).

Almost surely, 2^{78858560545657} is an apocalyptic number.

It is an amenable number.

78858560545657 is a deficient number, since it is larger than the sum of its proper divisors (1).

78858560545657 is an equidigital number, since it uses as much as digits as its factorization.

78858560545657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11289600000, while the sum is 79.

The spelling of 78858560545657 in words is "seventy-eight trillion, eight hundred fifty-eight billion, five hundred sixty million, five hundred forty-five thousand, six hundred fifty-seven".