855431999999999 has 4 divisors (see below), whose sum is σ = 867480338028240. Its totient is φ = 843383661971760.

The previous prime is 855431999999947. The next prime is 855432000000001. The reversal of 855431999999999 is 999999999134558.

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 855431999999999 - 2²⁴ = 855431983222783 is a prime.

It is a Duffinian number.

855431999999999 is a modest number, since divided by 99999999 gives 8554319 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 855431999999896 and 855431999999905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855431999995999) 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, 6024169014014 + ... + 6024169014155.

It is an arithmetic number, because the mean of its divisors is an integer number (216870084507060).

Almost surely, 2^{855431999999999} is an apocalyptic number.

855431999999999 is a deficient number, since it is larger than the sum of its proper divisors (12048338028241).

855431999999999 is a wasteful number, since it uses less digits than its factorization.

855431999999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12048338028240.

The product of its digits is 929809173600, while the sum is 107.

The spelling of 855431999999999 in words is "eight hundred fifty-five trillion, four hundred thirty-one billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".