855444996391 has 4 divisors (see below), whose sum is σ = 859281072832. Its totient is φ = 851608919952.

The previous prime is 855444996349. The next prime is 855444996407. The reversal of 855444996391 is 193699444558.

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

It is a cyclic number.

It is not a de Polignac number, because 855444996391 - 2³⁵ = 821085258023 is a prime.

It is a super-2 number, since 2×855444996391² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855444996331) 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, 1918037886 + ... + 1918038331.

It is an arithmetic number, because the mean of its divisors is an integer number (214820268208).

Almost surely, 2^855444996391 is an apocalyptic number.

855444996391 is a deficient number, since it is larger than the sum of its proper divisors (3836076441).

855444996391 is a wasteful number, since it uses less digits than its factorization.

855444996391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3836076440.

The product of its digits is 167961600, while the sum is 67.

The spelling of 855444996391 in words is "eight hundred fifty-five billion, four hundred forty-four million, nine hundred ninety-six thousand, three hundred ninety-one".