81695853 has 12 divisors (see below), whose sum is σ = 118106560. Its totient is φ = 54417096.

The previous prime is 81695807. The next prime is 81695893. The reversal of 81695853 is 35859618.

81695853 is a `hidden beast` number, since 8 + 1 + 69 + 585 + 3 = 666.

It is not a de Polignac number, because 81695853 - 2⁸ = 81695597 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81695799 and 81695808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81695893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9618 + ... + 15996.

Almost surely, 2^81695853 is an apocalyptic number.

It is an amenable number.

81695853 is a deficient number, since it is larger than the sum of its proper divisors (36410707).

81695853 is a wasteful number, since it uses less digits than its factorization.

81695853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7808 (or 7805 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 81695853 is about 9038.5758280827. The cubic root of 81695853 is about 433.9103444808.

It can be divided in two parts, 816 and 95853, that added together give a palindrome (96669).

The spelling of 81695853 in words is "eighty-one million, six hundred ninety-five thousand, eight hundred fifty-three".