81825330279 has 24 divisors (see below), whose sum is σ = 137051797120. Its totient is φ = 42506663760.

The previous prime is 81825330247. The next prime is 81825330319. The reversal of 81825330279 is 97203352818.

It is a happy number.

It is not a de Polignac number, because 81825330279 - 2⁵ = 81825330247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81825330229) 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 23 ways as a sum of consecutive naturals, for example, 16098469 + ... + 16103550.

Almost surely, 2^81825330279 is an apocalyptic number.

81825330279 is a deficient number, since it is larger than the sum of its proper divisors (55226466841).

81825330279 is a wasteful number, since it uses less digits than its factorization.

81825330279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32202051 (or 32202040 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 48.

The spelling of 81825330279 in words is "eighty-one billion, eight hundred twenty-five million, three hundred thirty thousand, two hundred seventy-nine".