81733673505 has 24 divisors (see below), whose sum is σ = 143743190976. Its totient is φ = 39628446880.

The previous prime is 81733673477. The next prime is 81733673513. The reversal of 81733673505 is 50537633718.

It is not a de Polignac number, because 81733673505 - 2⁵ = 81733673473 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22514349 + ... + 22517978.

It is an arithmetic number, because the mean of its divisors is an integer number (5989299624).

Almost surely, 2^81733673505 is an apocalyptic number.

It is an amenable number.

81733673505 is a deficient number, since it is larger than the sum of its proper divisors (62009517471).

81733673505 is a wasteful number, since it uses less digits than its factorization.

81733673505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45032357 (or 45032346 counting only the distinct ones).

The product of its (nonzero) digits is 1587600, while the sum is 48.

The spelling of 81733673505 in words is "eighty-one billion, seven hundred thirty-three million, six hundred seventy-three thousand, five hundred five".