81340027753 has 8 divisors (see below), whose sum is σ = 84398951936. Its totient is φ = 78308294400.

The previous prime is 81340027711. The next prime is 81340027757. The reversal of 81340027753 is 35772004318.

It is a happy number.

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-81340027753 is a prime.

It is a super-2 number, since 2×81340027753² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81340027757) 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, 6791613 + ... + 6803578.

It is an arithmetic number, because the mean of its divisors is an integer number (10549868992).

Almost surely, 2^81340027753 is an apocalyptic number.

It is an amenable number.

81340027753 is a deficient number, since it is larger than the sum of its proper divisors (3058924183).

81340027753 is a wasteful number, since it uses less digits than its factorization.

81340027753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13595415.

The product of its (nonzero) digits is 141120, while the sum is 40.

The spelling of 81340027753 in words is "eighty-one billion, three hundred forty million, twenty-seven thousand, seven hundred fifty-three".