857855001109 has 4 divisors (see below), whose sum is σ = 868190603616. Its totient is φ = 847519398604.

The previous prime is 857855001103. The next prime is 857855001119. The reversal of 857855001109 is 901100558758.

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 not a de Polignac number, because 857855001109 - 2¹¹ = 857854999061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857855001103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5167801129 + ... + 5167801294.

It is an arithmetic number, because the mean of its divisors is an integer number (217047650904).

Almost surely, 2^857855001109 is an apocalyptic number.

It is an amenable number.

857855001109 is a deficient number, since it is larger than the sum of its proper divisors (10335602507).

857855001109 is a wasteful number, since it uses less digits than its factorization.

857855001109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10335602506.

The product of its (nonzero) digits is 504000, while the sum is 49.

The spelling of 857855001109 in words is "eight hundred fifty-seven billion, eight hundred fifty-five million, one thousand, one hundred nine".