81332641753797 has 64 divisors (see below), whose sum is σ = 138787053004800. Its totient is φ = 41243320903680.

The previous prime is 81332641753747. The next prime is 81332641753799. The reversal of 81332641753797 is 79735714623318.

It is not a de Polignac number, because 81332641753797 - 2¹⁰ = 81332641752773 is a prime.

It is a super-2 number, since 2×81332641753797² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81332641753799) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26982672 + ... + 29845097.

It is an arithmetic number, because the mean of its divisors is an integer number (2168547703200).

Almost surely, 2^{81332641753797} is an apocalyptic number.

It is an amenable number.

81332641753797 is a deficient number, since it is larger than the sum of its proper divisors (57454411251003).

81332641753797 is a wasteful number, since it uses less digits than its factorization.

81332641753797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56828026.

The product of its digits is 160030080, while the sum is 66.

The spelling of 81332641753797 in words is "eighty-one trillion, three hundred thirty-two billion, six hundred forty-one million, seven hundred fifty-three thousand, seven hundred ninety-seven".