857358528381 has 12 divisors (see below), whose sum is σ = 1239005343420. Its totient is φ = 571296084480.

The previous prime is 857358528373. The next prime is 857358528427. The reversal of 857358528381 is 183825853758.

857358528381 is a `hidden beast` number, since 8 + 5 + 73 + 5 + 8 + 528 + 38 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 199206005625 + 658152522756 = 446325^2 + 811266^2 .

It is not a de Polignac number, because 857358528381 - 2³ = 857358528373 is a prime.

It is a super-2 number, since 2×857358528381² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857358528581) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23002660 + ... + 23039901.

It is an arithmetic number, because the mean of its divisors is an integer number (103250445285).

Almost surely, 2^857358528381 is an apocalyptic number.

It is an amenable number.

857358528381 is a deficient number, since it is larger than the sum of its proper divisors (381646815039).

857358528381 is a wasteful number, since it uses less digits than its factorization.

857358528381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46044636 (or 46044633 counting only the distinct ones).

The product of its digits is 64512000, while the sum is 63.

The spelling of 857358528381 in words is "eight hundred fifty-seven billion, three hundred fifty-eight million, five hundred twenty-eight thousand, three hundred eighty-one".