81053575448 has 32 divisors (see below), whose sum is σ = 154207879920. Its totient is φ = 39935280000.

The previous prime is 81053575439. The next prime is 81053575469. The reversal of 81053575448 is 84457535018.

It is a junction number, because it is equal to n+sod(n) for n = 81053575396 and 81053575405.

It is a congruent number.

It is an unprimeable number.

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, 67223 + ... + 408198.

Almost surely, 2^81053575448 is an apocalyptic number.

It is an amenable number.

81053575448 is a deficient number, since it is larger than the sum of its proper divisors (73154304472).

81053575448 is a wasteful number, since it uses less digits than its factorization.

81053575448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475739 (or 475735 counting only the distinct ones).

The product of its (nonzero) digits is 2688000, while the sum is 50.

The spelling of 81053575448 in words is "eighty-one billion, fifty-three million, five hundred seventy-five thousand, four hundred forty-eight".