81835169029 has 4 divisors (see below), whose sum is σ = 83379228876. Its totient is φ = 80291109184.

The previous prime is 81835168999. The next prime is 81835169051. The reversal of 81835169029 is 92096153818.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29352940929 + 52482228100 = 171327^2 + 229090^2 .

It is a cyclic number.

It is not a de Polignac number, because 81835169029 - 2²³ = 81826780421 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 (81835169069) 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, 772029844 + ... + 772029949.

It is an arithmetic number, because the mean of its divisors is an integer number (20844807219).

Almost surely, 2^81835169029 is an apocalyptic number.

It is an amenable number.

81835169029 is a deficient number, since it is larger than the sum of its proper divisors (1544059847).

81835169029 is a wasteful number, since it uses less digits than its factorization.

81835169029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544059846.

The product of its (nonzero) digits is 933120, while the sum is 52.

The spelling of 81835169029 in words is "eighty-one billion, eight hundred thirty-five million, one hundred sixty-nine thousand, twenty-nine".