812644564102 has 16 divisors (see below), whose sum is σ = 1393667442720. Its totient is φ = 348135622848.

The previous prime is 812644564091. The next prime is 812644564103. The reversal of 812644564102 is 201465446218.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812644564103) 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 7 ways as a sum of consecutive naturals, for example, 11682327 + ... + 11751682.

It is an arithmetic number, because the mean of its divisors is an integer number (87104215170).

Almost surely, 2^812644564102 is an apocalyptic number.

812644564102 is a deficient number, since it is larger than the sum of its proper divisors (581022878618).

812644564102 is a wasteful number, since it uses less digits than its factorization.

812644564102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23436495.

The product of its (nonzero) digits is 368640, while the sum is 43.

The spelling of 812644564102 in words is "eight hundred twelve billion, six hundred forty-four million, five hundred sixty-four thousand, one hundred two".