81732724133 has 8 divisors (see below), whose sum is σ = 82098840096. Its totient is φ = 81366930000.

The previous prime is 81732724121. The next prime is 81732724153. The reversal of 81732724133 is 33142723718.

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

It is a cyclic number.

It is not a de Polignac number, because 81732724133 - 2⁶ = 81732724069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81732724153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 435998 + ... + 594608.

It is an arithmetic number, because the mean of its divisors is an integer number (10262355012).

Almost surely, 2^81732724133 is an apocalyptic number.

It is an amenable number.

81732724133 is a deficient number, since it is larger than the sum of its proper divisors (366115963).

81732724133 is a wasteful number, since it uses less digits than its factorization.

81732724133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160915.

The product of its digits is 169344, while the sum is 41.

The spelling of 81732724133 in words is "eighty-one billion, seven hundred thirty-two million, seven hundred twenty-four thousand, one hundred thirty-three".