821096144168 has 8 divisors (see below), whose sum is σ = 1539555270330. Its totient is φ = 410548072080.

The previous prime is 821096144153. The next prime is 821096144171. The reversal of 821096144168 is 861441690128.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 818188993444 + 2907150724 = 904538^2 + 53918^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51318509003 + ... + 51318509018.

Almost surely, 2^821096144168 is an apocalyptic number.

It is an amenable number.

821096144168 is a deficient number, since it is larger than the sum of its proper divisors (718459126162).

821096144168 is a wasteful number, since it uses less digits than its factorization.

821096144168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102637018027 (or 102637018023 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 50.

The spelling of 821096144168 in words is "eight hundred twenty-one billion, ninety-six million, one hundred forty-four thousand, one hundred sixty-eight".