812551273812 has 18 divisors (see below), whose sum is σ = 2053949053338. Its totient is φ = 270850424592.

The previous prime is 812551273799. The next prime is 812551273871. The reversal of 812551273812 is 218372155218.

812551273812 is a `hidden beast` number, since 8 + 1 + 255 + 12 + 7 + 381 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 812388558276 + 162715536 = 901326^2 + 12756^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×812551273812² (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 5 ways as a sum of consecutive naturals, for example, 11285434323 + ... + 11285434394.

It is an arithmetic number, because the mean of its divisors is an integer number (114108280741).

Almost surely, 2^812551273812 is an apocalyptic number.

It is an amenable number.

812551273812 is an abundant number, since it is smaller than the sum of its proper divisors (1241397779526).

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

812551273812 is a wasteful number, since it uses less digits than its factorization.

812551273812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22570868727 (or 22570868722 counting only the distinct ones).

The product of its digits is 268800, while the sum is 45.

The spelling of 812551273812 in words is "eight hundred twelve billion, five hundred fifty-one million, two hundred seventy-three thousand, eight hundred twelve".