812069526538 has 16 divisors (see below), whose sum is σ = 1255026971016. Its totient is φ = 393841692160.

The previous prime is 812069526493. The next prime is 812069526539. The reversal of 812069526538 is 835625960218.

It can be written as a sum of positive squares in 4 ways, for example, as 515901737169 + 296167789369 = 718263^2 + 544213^2 .

It is not an unprimeable number, because it can be changed into a prime (812069526539) 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 in 7 ways as a sum of consecutive naturals, for example, 28608031 + ... + 28636402.

Almost surely, 2^812069526538 is an apocalyptic number.

812069526538 is a deficient number, since it is larger than the sum of its proper divisors (442957444478).

812069526538 is a wasteful number, since it uses less digits than its factorization.

812069526538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57244649.

The product of its (nonzero) digits is 6220800, while the sum is 55.

The spelling of 812069526538 in words is "eight hundred twelve billion, sixty-nine million, five hundred twenty-six thousand, five hundred thirty-eight".