81853610359 has 8 divisors (see below), whose sum is σ = 83729451008. Its totient is φ = 79997009400.

The previous prime is 81853610357. The next prime is 81853610387. The reversal of 81853610359 is 95301635818.

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 81853610359 - 2¹ = 81853610357 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 (81853610357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4801317 + ... + 4818334.

It is an arithmetic number, because the mean of its divisors is an integer number (10466181376).

Almost surely, 2^81853610359 is an apocalyptic number.

81853610359 is a deficient number, since it is larger than the sum of its proper divisors (1875840649).

81853610359 is a wasteful number, since it uses less digits than its factorization.

81853610359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9619845.

The product of its (nonzero) digits is 777600, while the sum is 49.

The spelling of 81853610359 in words is "eighty-one billion, eight hundred fifty-three million, six hundred ten thousand, three hundred fifty-nine".