811378805546 has 8 divisors (see below), whose sum is σ = 1217101169700. Its totient is φ = 405678415648.

The previous prime is 811378805509. The next prime is 811378805563. The reversal of 811378805546 is 645508873118.

It can be written as a sum of positive squares in 2 ways, for example, as 758573063521 + 52805742025 = 870961^2 + 229795^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 811378805491 and 811378805500.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5400941 + ... + 5549136.

Almost surely, 2^811378805546 is an apocalyptic number.

811378805546 is a deficient number, since it is larger than the sum of its proper divisors (405722364154).

811378805546 is a wasteful number, since it uses less digits than its factorization.

811378805546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10987128.

The product of its (nonzero) digits is 6451200, while the sum is 56.

The spelling of 811378805546 in words is "eight hundred eleven billion, three hundred seventy-eight million, eight hundred five thousand, five hundred forty-six".