812166727356 has 36 divisors (see below), whose sum is σ = 2058254616600. Its totient is φ = 270026293728.

The previous prime is 812166727349. The next prime is 812166727363. The reversal of 812166727356 is 653727661218.

812166727356 is a `hidden beast` number, since 8 + 1 + 216 + 6 + 72 + 7 + 356 = 666.

It is an interprime number because it is at equal distance from previous prime (812166727349) and next prime (812166727363).

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×812166727356² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28983666 + ... + 29011673.

It is an arithmetic number, because the mean of its divisors is an integer number (57173739350).

Almost surely, 2^812166727356 is an apocalyptic number.

It is an amenable number.

812166727356 is an abundant number, since it is smaller than the sum of its proper divisors (1246087889244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

812166727356 is a wasteful number, since it uses less digits than its factorization.

812166727356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57995738 (or 57995733 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

The spelling of 812166727356 in words is "eight hundred twelve billion, one hundred sixty-six million, seven hundred twenty-seven thousand, three hundred fifty-six".