855445989741831 has 20 divisors (see below), whose sum is σ = 1277890441799400. Its totient is φ = 570296439293616.

The previous prime is 855445989741829. The next prime is 855445989741851. The reversal of 855445989741831 is 138147989544558.

855445989741831 is a `hidden beast` number, since 8 + 5 + 5 + 4 + 4 + 598 + 9 + 7 + 4 + 18 + 3 + 1 = 666.

It is not a de Polignac number, because 855445989741831 - 2¹ = 855445989741829 is a prime.

It is a super-2 number, since 2×855445989741831² (a number of 31 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855445989741851) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 46401505 + ... + 62161013.

It is an arithmetic number, because the mean of its divisors is an integer number (63894522089970).

Almost surely, 2^{855445989741831} is an apocalyptic number.

855445989741831 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

855445989741831 is a deficient number, since it is larger than the sum of its proper divisors (422444452057569).

855445989741831 is a wasteful number, since it uses less digits than its factorization.

855445989741831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16429660 (or 16429651 counting only the distinct ones).

The product of its digits is 6967296000, while the sum is 81.

The spelling of 855445989741831 in words is "eight hundred fifty-five trillion, four hundred forty-five billion, nine hundred eighty-nine million, seven hundred forty-one thousand, eight hundred thirty-one".