812006720585651 has 4 divisors (see below), whose sum is σ = 813344458181952. Its totient is φ = 810668982989352.

The previous prime is 812006720585597. The next prime is 812006720585693. The reversal of 812006720585651 is 156585027600218.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 812006720585651 - 2¹⁰ = 812006720584627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812006722585651) 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 3 ways as a sum of consecutive naturals, for example, 668868797240 + ... + 668868798453.

It is an arithmetic number, because the mean of its divisors is an integer number (203336114545488).

Almost surely, 2^{812006720585651} is an apocalyptic number.

812006720585651 is a deficient number, since it is larger than the sum of its proper divisors (1337737596301).

812006720585651 is a wasteful number, since it uses less digits than its factorization.

812006720585651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337737596300.

The product of its (nonzero) digits is 8064000, while the sum is 56.

The spelling of 812006720585651 in words is "eight hundred twelve trillion, six billion, seven hundred twenty million, five hundred eighty-five thousand, six hundred fifty-one".