81382060033 has 4 divisors (see below), whose sum is σ = 84007287808. Its totient is φ = 78756832260.

The previous prime is 81382059953. The next prime is 81382060049. The reversal of 81382060033 is 33006028318.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81382060033 is a prime.

It is a super-2 number, since 2×81382060033² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81382060073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1312613841 + ... + 1312613902.

It is an arithmetic number, because the mean of its divisors is an integer number (21001821952).

Almost surely, 2^81382060033 is an apocalyptic number.

It is an amenable number.

81382060033 is a deficient number, since it is larger than the sum of its proper divisors (2625227775).

81382060033 is a wasteful number, since it uses less digits than its factorization.

81382060033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2625227774.

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 81382060033 in words is "eighty-one billion, three hundred eighty-two million, sixty thousand, thirty-three".