81325760053 has 16 divisors (see below), whose sum is σ = 85280791680. Its totient is φ = 77406476224.

The previous prime is 81325759997. The next prime is 81325760069. The reversal of 81325760053 is 35006752318.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81325760053 is a prime.

It is a super-2 number, since 2×81325760053² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81325759988 and 81325760015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81325760083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4593903 + ... + 4611571.

It is an arithmetic number, because the mean of its divisors is an integer number (5330049480).

Almost surely, 2^81325760053 is an apocalyptic number.

It is an amenable number.

81325760053 is a deficient number, since it is larger than the sum of its proper divisors (3955031627).

81325760053 is a wasteful number, since it uses less digits than its factorization.

81325760053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18668.

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 81325760053 in words is "eighty-one billion, three hundred twenty-five million, seven hundred sixty thousand, fifty-three".