857506822913 has 8 divisors (see below), whose sum is σ = 923576274600. Its totient is φ = 791452712448.

The previous prime is 857506822897. The next prime is 857506822933. The reversal of 857506822913 is 319228605758.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 230827249 + 857275995664 = 15193^2 + 925892^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 857506822913 - 2⁴ = 857506822897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (857506822933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3719078 + ... + 3942911.

It is an arithmetic number, because the mean of its divisors is an integer number (115447034325).

Almost surely, 2^857506822913 is an apocalyptic number.

It is an amenable number.

857506822913 is a deficient number, since it is larger than the sum of its proper divisors (66069451687).

857506822913 is a wasteful number, since it uses less digits than its factorization.

857506822913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7670611.

The product of its (nonzero) digits is 7257600, while the sum is 56.

The spelling of 857506822913 in words is "eight hundred fifty-seven billion, five hundred six million, eight hundred twenty-two thousand, nine hundred thirteen".