855638899177 has 2 divisors, whose sum is σ = 855638899178. Its totient is φ = 855638899176.

The previous prime is 855638899069. The next prime is 855638899211. The reversal of 855638899177 is 771998836558.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 772519702761 + 83119196416 = 878931^2 + 288304^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-855638899177 is a prime.

It is not a weakly prime, because it can be changed into another prime (855638899477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427819449588 + 427819449589.

It is an arithmetic number, because the mean of its divisors is an integer number (427819449589).

Almost surely, 2^855638899177 is an apocalyptic number.

It is an amenable number.

855638899177 is a deficient number, since it is larger than the sum of its proper divisors (1).

855638899177 is an equidigital number, since it uses as much as digits as its factorization.

855638899177 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 914457600, while the sum is 76.

The spelling of 855638899177 in words is "eight hundred fifty-five billion, six hundred thirty-eight million, eight hundred ninety-nine thousand, one hundred seventy-seven".