812805635612 has 12 divisors (see below), whose sum is σ = 1424334644040. Its totient is φ = 405852880176.

The previous prime is 812805635581. The next prime is 812805635627. The reversal of 812805635612 is 216536508218.

It is a super-2 number, since 2×812805635612² (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 3 ways as a sum of consecutive naturals, for example, 137481083 + ... + 137486994.

It is an arithmetic number, because the mean of its divisors is an integer number (118694553670).

Almost surely, 2^812805635612 is an apocalyptic number.

It is an amenable number.

812805635612 is a deficient number, since it is larger than the sum of its proper divisors (611529008428).

812805635612 is a wasteful number, since it uses less digits than its factorization.

812805635612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274968820 (or 274968818 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 47.

The spelling of 812805635612 in words is "eight hundred twelve billion, eight hundred five million, six hundred thirty-five thousand, six hundred twelve".