857953739985 has 16 divisors (see below), whose sum is σ = 1386317332800. Its totient is φ = 453044878400.

The previous prime is 857953739977. The next prime is 857953739987. The reversal of 857953739985 is 589937359758.

It is not a de Polignac number, because 857953739985 - 2³ = 857953739977 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 857953739985.

It is not an unprimeable number, because it can be changed into a prime (857953739987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 283151535 + ... + 283154564.

It is an arithmetic number, because the mean of its divisors is an integer number (86644833300).

Almost surely, 2^857953739985 is an apocalyptic number.

It is an amenable number.

857953739985 is a deficient number, since it is larger than the sum of its proper divisors (528363592815).

857953739985 is a wasteful number, since it uses less digits than its factorization.

857953739985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566306208.

The product of its digits is 2571912000, while the sum is 78.

The spelling of 857953739985 in words is "eight hundred fifty-seven billion, nine hundred fifty-three million, seven hundred thirty-nine thousand, nine hundred eighty-five".