857785593881 has 2 divisors, whose sum is σ = 857785593882. Its totient is φ = 857785593880.

The previous prime is 857785593877. The next prime is 857785593893. The reversal of 857785593881 is 188395587758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 591028838656 + 266756755225 = 768784^2 + 516485^2 .

It is a cyclic number.

It is not a de Polignac number, because 857785593881 - 2² = 857785593877 is a prime.

It is a super-2 number, since 2×857785593881² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 857785593799 and 857785593808.

It is not a weakly prime, because it can be changed into another prime (857785533881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428892796940 + 428892796941.

It is an arithmetic number, because the mean of its divisors is an integer number (428892796941).

Almost surely, 2^857785593881 is an apocalyptic number.

It is an amenable number.

857785593881 is a deficient number, since it is larger than the sum of its proper divisors (1).

857785593881 is an equidigital number, since it uses as much as digits as its factorization.

857785593881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376000, while the sum is 74.

The spelling of 857785593881 in words is "eight hundred fifty-seven billion, seven hundred eighty-five million, five hundred ninety-three thousand, eight hundred eighty-one".