812813776138 has 32 divisors (see below), whose sum is σ = 1500908242176. Its totient is φ = 321482210688.

The previous prime is 812813776121. The next prime is 812813776193. The reversal of 812813776138 is 831677318218.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 346870 + ... + 1321342.

It is an arithmetic number, because the mean of its divisors is an integer number (46903382568).

Almost surely, 2^812813776138 is an apocalyptic number.

812813776138 is a deficient number, since it is larger than the sum of its proper divisors (688094466038).

812813776138 is a wasteful number, since it uses less digits than its factorization.

812813776138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979078.

The product of its digits is 2709504, while the sum is 55.

The spelling of 812813776138 in words is "eight hundred twelve billion, eight hundred thirteen million, seven hundred seventy-six thousand, one hundred thirty-eight".