858747747857 has 4 divisors (see below), whose sum is σ = 858809448996. Its totient is φ = 858686046720.

The previous prime is 858747747839. The next prime is 858747747859. The reversal of 858747747857 is 758747747858.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 343555410496 + 515192337361 = 586136^2 + 717769^2 .

It is a cyclic number.

It is not a de Polignac number, because 858747747857 - 2⁸ = 858747747601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (858747747859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30829688 + ... + 30857529.

It is an arithmetic number, because the mean of its divisors is an integer number (214702362249).

Almost surely, 2^858747747857 is an apocalyptic number.

It is an amenable number.

858747747857 is a deficient number, since it is larger than the sum of its proper divisors (61701139).

858747747857 is a wasteful number, since it uses less digits than its factorization.

858747747857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61701138.

The product of its digits is 3442073600, while the sum is 77.

Subtracting from 858747747857 its reverse (758747747858), we obtain a palindrome (99999999999).

The spelling of 858747747857 in words is "eight hundred fifty-eight billion, seven hundred forty-seven million, seven hundred forty-seven thousand, eight hundred fifty-seven".