85623512857 has 2 divisors, whose sum is σ = 85623512858. Its totient is φ = 85623512856.

The previous prime is 85623512851. The next prime is 85623512881. The reversal of 85623512857 is 75821532658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65872302336 + 19751210521 = 256656^2 + 140539^2 .

It is a cyclic number.

It is not a de Polignac number, because 85623512857 - 2³¹ = 83476029209 is a prime.

It is not a weakly prime, because it can be changed into another prime (85623512851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42811756428 + 42811756429.

It is an arithmetic number, because the mean of its divisors is an integer number (42811756429).

Almost surely, 2^85623512857 is an apocalyptic number.

It is an amenable number.

85623512857 is a deficient number, since it is larger than the sum of its proper divisors (1).

85623512857 is an equidigital number, since it uses as much as digits as its factorization.

85623512857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032000, while the sum is 52.

The spelling of 85623512857 in words is "eighty-five billion, six hundred twenty-three million, five hundred twelve thousand, eight hundred fifty-seven".