81633049922 has 6 divisors (see below), whose sum is σ = 122450180979. Its totient is φ = 40816322930.

The previous prime is 81633049829. The next prime is 81633049933. The reversal of 81633049922 is 22994033618.

It can be written as a sum of positive squares in only one way, i.e., 40816524961 + 40816524961 = 202031^2 + 202031^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=202031.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 303047 + ... + 505077.

Almost surely, 2^81633049922 is an apocalyptic number.

81633049922 is a deficient number, since it is larger than the sum of its proper divisors (40817131057).

81633049922 is an frugal number, since it uses more digits than its factorization.

81633049922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404064 (or 202033 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 47.

The spelling of 81633049922 in words is "eighty-one billion, six hundred thirty-three million, forty-nine thousand, nine hundred twenty-two".