821803040266 has 8 divisors (see below), whose sum is σ = 1327527988164. Its totient is φ = 379293710880.

The previous prime is 821803040249. The next prime is 821803040323. The reversal of 821803040266 is 662040308128.

It can be written as a sum of positive squares in 2 ways, for example, as 819939305025 + 1863735241 = 905505^2 + 43171^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 15803904595 + ... + 15803904646.

Almost surely, 2^821803040266 is an apocalyptic number.

821803040266 is a deficient number, since it is larger than the sum of its proper divisors (505724947898).

821803040266 is a wasteful number, since it uses less digits than its factorization.

821803040266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31607809256.

The product of its (nonzero) digits is 110592, while the sum is 40.

The spelling of 821803040266 in words is "eight hundred twenty-one billion, eight hundred three million, forty thousand, two hundred sixty-six".