812027021895 has 16 divisors (see below), whose sum is σ = 1443603594720. Its totient is φ = 433081078272.

The previous prime is 812027021849. The next prime is 812027021933. The reversal of 812027021895 is 598120720218.

812027021895 is a `hidden beast` number, since 81 + 2 + 0 + 270 + 218 + 95 = 666.

It is not a de Polignac number, because 812027021895 - 2¹⁸ = 812026759751 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 812027021895.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3007507354 + ... + 3007507623.

It is an arithmetic number, because the mean of its divisors is an integer number (90225224670).

Almost surely, 2^812027021895 is an apocalyptic number.

812027021895 is a deficient number, since it is larger than the sum of its proper divisors (631576572825).

812027021895 is a wasteful number, since it uses less digits than its factorization.

812027021895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6015014991 (or 6015014985 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 812027021895 in words is "eight hundred twelve billion, twenty-seven million, twenty-one thousand, eight hundred ninety-five".