857117785579 has 16 divisors (see below), whose sum is σ = 950511306240. Its totient is φ = 766307124000.

The previous prime is 857117785549. The next prime is 857117785603. The reversal of 857117785579 is 975587711758.

It is not a de Polignac number, because 857117785579 - 2⁹ = 857117785067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (857117785549) 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 in 15 ways as a sum of consecutive naturals, for example, 4454494 + ... + 4642924.

It is an arithmetic number, because the mean of its divisors is an integer number (59406956640).

Almost surely, 2^857117785579 is an apocalyptic number.

857117785579 is a deficient number, since it is larger than the sum of its proper divisors (93393520661).

857117785579 is a wasteful number, since it uses less digits than its factorization.

857117785579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195282.

The product of its digits is 172872000, while the sum is 70.

The spelling of 857117785579 in words is "eight hundred fifty-seven billion, one hundred seventeen million, seven hundred eighty-five thousand, five hundred seventy-nine".