812543267878 has 4 divisors (see below), whose sum is σ = 1218814901820. Its totient is φ = 406271633938.

The previous prime is 812543267863. The next prime is 812543267903. The reversal of 812543267878 is 878762345218.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203135816968 + ... + 203135816971.

It is an arithmetic number, because the mean of its divisors is an integer number (304703725455).

Almost surely, 2^812543267878 is an apocalyptic number.

812543267878 is a deficient number, since it is larger than the sum of its proper divisors (406271633942).

812543267878 is a wasteful number, since it uses less digits than its factorization.

812543267878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406271633941.

The product of its digits is 36126720, while the sum is 61.

The spelling of 812543267878 in words is "eight hundred twelve billion, five hundred forty-three million, two hundred sixty-seven thousand, eight hundred seventy-eight".