878765676809 has 2 divisors, whose sum is σ = 878765676810. Its totient is φ = 878765676808.

The previous prime is 878765676787. The next prime is 878765676823. The reversal of 878765676809 is 908676567878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 869444353600 + 9321323209 = 932440^2 + 96547^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-878765676809 is a prime.

It is a super-2 number, since 2×878765676809² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 878765676809.

It is not a weakly prime, because it can be changed into another prime (878765676839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439382838404 + 439382838405.

It is an arithmetic number, because the mean of its divisors is an integer number (439382838405).

Almost surely, 2^878765676809 is an apocalyptic number.

It is an amenable number.

878765676809 is a deficient number, since it is larger than the sum of its proper divisors (1).

878765676809 is an equidigital number, since it uses as much as digits as its factorization.

878765676809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1706987520, while the sum is 77.

The spelling of 878765676809 in words is "eight hundred seventy-eight billion, seven hundred sixty-five million, six hundred seventy-six thousand, eight hundred nine".