81650053434 has 8 divisors (see below), whose sum is σ = 163300106880. Its totient is φ = 27216684476.

The previous prime is 81650053411. The next prime is 81650053439. The reversal of 81650053434 is 43435005618.

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

81650053434 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81650053392 and 81650053401.

It is not an unprimeable number, because it can be changed into a prime (81650053439) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6804171114 + ... + 6804171125.

It is an arithmetic number, because the mean of its divisors is an integer number (20412513360).

Almost surely, 2^81650053434 is an apocalyptic number.

81650053434 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81650053434 is a wasteful number, since it uses less digits than its factorization.

81650053434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13608342244.

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 81650053434 in words is "eighty-one billion, six hundred fifty million, fifty-three thousand, four hundred thirty-four".