878371855957 has 2 divisors, whose sum is σ = 878371855958. Its totient is φ = 878371855956.

The previous prime is 878371855931. The next prime is 878371855987. The reversal of 878371855957 is 759558173878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 821006336836 + 57365519121 = 906094^2 + 239511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-878371855957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 878371855957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (878371855987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439185927978 + 439185927979.

It is an arithmetic number, because the mean of its divisors is an integer number (439185927979).

Almost surely, 2^878371855957 is an apocalyptic number.

It is an amenable number.

878371855957 is a deficient number, since it is larger than the sum of its proper divisors (1).

878371855957 is an equidigital number, since it uses as much as digits as its factorization.

878371855957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 592704000, while the sum is 73.

The spelling of 878371855957 in words is "eight hundred seventy-eight billion, three hundred seventy-one million, eight hundred fifty-five thousand, nine hundred fifty-seven".