855847748557 has 4 divisors (see below), whose sum is σ = 856839461760. Its totient is φ = 854856035356.

The previous prime is 855847748551. The next prime is 855847748579. The reversal of 855847748557 is 755847748558.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-855847748557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 855847748557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855847748551) 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, 495855307 + ... + 495857032.

It is an arithmetic number, because the mean of its divisors is an integer number (214209865440).

Almost surely, 2^855847748557 is an apocalyptic number.

It is an amenable number.

855847748557 is a deficient number, since it is larger than the sum of its proper divisors (991713203).

855847748557 is an equidigital number, since it uses as much as digits as its factorization.

855847748557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991713202.

The product of its digits is 1756160000, while the sum is 73.

Subtracting from 855847748557 its reverse (755847748558), we obtain a palindrome (99999999999).

The spelling of 855847748557 in words is "eight hundred fifty-five billion, eight hundred forty-seven million, seven hundred forty-eight thousand, five hundred fifty-seven".