81500434433 has 8 divisors (see below), whose sum is σ = 89360884800. Its totient is φ = 73715204080.

The previous prime is 81500434423. The next prime is 81500434439. The reversal of 81500434433 is 33443400518.

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 81500434433 - 2¹⁴ = 81500418049 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81500434393 and 81500434402.

It is not an unprimeable number, because it can be changed into a prime (81500434439) 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, 18802733 + ... + 18807066.

It is an arithmetic number, because the mean of its divisors is an integer number (11170110600).

Almost surely, 2^81500434433 is an apocalyptic number.

It is an amenable number.

81500434433 is a deficient number, since it is larger than the sum of its proper divisors (7860450367).

81500434433 is a wasteful number, since it uses less digits than its factorization.

81500434433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37610007.

The product of its (nonzero) digits is 69120, while the sum is 35.

The spelling of 81500434433 in words is "eighty-one billion, five hundred million, four hundred thirty-four thousand, four hundred thirty-three".