78855887458841 has 2 divisors, whose sum is σ = 78855887458842. Its totient is φ = 78855887458840.

The previous prime is 78855887458811. The next prime is 78855887458891. The reversal of 78855887458841 is 14885478855887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59442866406400 + 19413021052441 = 7709920^2 + 4406021^2 .

It is a cyclic number.

It is not a de Polignac number, because 78855887458841 - 2³⁴ = 78838707589657 is a prime.

It is not a weakly prime, because it can be changed into another prime (78855887458811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39427943729420 + 39427943729421.

It is an arithmetic number, because the mean of its divisors is an integer number (39427943729421).

Almost surely, 2^{78855887458841} is an apocalyptic number.

It is an amenable number.

78855887458841 is a deficient number, since it is larger than the sum of its proper divisors (1).

78855887458841 is an equidigital number, since it uses as much as digits as its factorization.

78855887458841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25690112000, while the sum is 86.

The spelling of 78855887458841 in words is "seventy-eight trillion, eight hundred fifty-five billion, eight hundred eighty-seven million, four hundred fifty-eight thousand, eight hundred forty-one".