812562820651 has 2 divisors, whose sum is σ = 812562820652. Its totient is φ = 812562820650.

The previous prime is 812562820649. The next prime is 812562820673. The reversal of 812562820651 is 156028265218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 812562820651 - 2¹ = 812562820649 is a prime.

Together with 812562820649, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (812562820051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406281410325 + 406281410326.

It is an arithmetic number, because the mean of its divisors is an integer number (406281410326).

Almost surely, 2^812562820651 is an apocalyptic number.

812562820651 is a deficient number, since it is larger than the sum of its proper divisors (1).

812562820651 is an equidigital number, since it uses as much as digits as its factorization.

812562820651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 460800, while the sum is 46.

The spelling of 812562820651 in words is "eight hundred twelve billion, five hundred sixty-two million, eight hundred twenty thousand, six hundred fifty-one".