81744296653 has 8 divisors (see below), whose sum is σ = 83758494456. Its totient is φ = 79731072000.

The previous prime is 81744296639. The next prime is 81744296671. The reversal of 81744296653 is 35669244718.

It can be written as a sum of positive squares in 4 ways, for example, as 2444610249 + 79299686404 = 49443^2 + 281602^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81744296653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81744296594 and 81744296603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81744296693) 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 7 ways as a sum of consecutive naturals, for example, 71748 + ... + 410653.

It is an arithmetic number, because the mean of its divisors is an integer number (10469811807).

Almost surely, 2^81744296653 is an apocalyptic number.

It is an amenable number.

81744296653 is a deficient number, since it is larger than the sum of its proper divisors (2014197803).

81744296653 is a wasteful number, since it uses less digits than its factorization.

81744296653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486575.

The product of its digits is 8709120, while the sum is 55.

The spelling of 81744296653 in words is "eighty-one billion, seven hundred forty-four million, two hundred ninety-six thousand, six hundred fifty-three".