878555659957 has 2 divisors, whose sum is σ = 878555659958. Its totient is φ = 878555659956.

The previous prime is 878555659913. The next prime is 878555659967. The reversal of 878555659957 is 759956555878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 573292779921 + 305262880036 = 757161^2 + 552506^2 .

It is a cyclic number.

It is not a de Polignac number, because 878555659957 - 2⁷ = 878555659829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (878555659967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439277829978 + 439277829979.

It is an arithmetic number, because the mean of its divisors is an integer number (439277829979).

Almost surely, 2^878555659957 is an apocalyptic number.

It is an amenable number.

878555659957 is a deficient number, since it is larger than the sum of its proper divisors (1).

878555659957 is an equidigital number, since it uses as much as digits as its factorization.

878555659957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4762800000, while the sum is 79.

The spelling of 878555659957 in words is "eight hundred seventy-eight billion, five hundred fifty-five million, six hundred fifty-nine thousand, nine hundred fifty-seven".