812166998559 has 192 divisors, whose sum is σ = 1425888368640. Its totient is φ = 401481400320.

The previous prime is 812166998543. The next prime is 812166998603. The reversal of 812166998559 is 955899661218.

It is not a de Polignac number, because 812166998559 - 2⁴ = 812166998543 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a junction number, because it is equal to n+sod(n) for n = 812166998493 and 812166998502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812166998959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1267030879 + ... + 1267031519.

It is an arithmetic number, because the mean of its divisors is an integer number (7426501920).

Almost surely, 2^812166998559 is an apocalyptic number.

812166998559 is a deficient number, since it is larger than the sum of its proper divisors (613721370081).

812166998559 is a wasteful number, since it uses less digits than its factorization.

812166998559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050 (or 1033 counting only the distinct ones).

The product of its digits is 83980800, while the sum is 69.

It can be divided in two parts, 8121669 and 98559, that added together give a palindrome (8220228).

The spelling of 812166998559 in words is "eight hundred twelve billion, one hundred sixty-six million, nine hundred ninety-eight thousand, five hundred fifty-nine".