81692443533 has 32 divisors (see below), whose sum is σ = 115791897600. Its totient is φ = 51119336576.

The previous prime is 81692443471. The next prime is 81692443541. The reversal of 81692443533 is 33534429618.

It is a cyclic number.

It is not a de Polignac number, because 81692443533 - 2²⁵ = 81658889101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81692443583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2298766 + ... + 2334032.

It is an arithmetic number, because the mean of its divisors is an integer number (3618496800).

Almost surely, 2^81692443533 is an apocalyptic number.

It is an amenable number.

81692443533 is a deficient number, since it is larger than the sum of its proper divisors (34099454067).

81692443533 is a wasteful number, since it uses less digits than its factorization.

81692443533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35921.

The product of its digits is 1866240, while the sum is 48.

The spelling of 81692443533 in words is "eighty-one billion, six hundred ninety-two million, four hundred forty-three thousand, five hundred thirty-three".