81395653244 has 12 divisors (see below), whose sum is σ = 142968012768. Its totient is φ = 40547649600.

The previous prime is 81395653187. The next prime is 81395653249. The reversal of 81395653244 is 44235659318.

It is a junction number, because it is equal to n+sod(n) for n = 81395653192 and 81395653201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81395653249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37543037 + ... + 37545204.

It is an arithmetic number, because the mean of its divisors is an integer number (11914001064).

Almost surely, 2^81395653244 is an apocalyptic number.

It is an amenable number.

81395653244 is a deficient number, since it is larger than the sum of its proper divisors (61572359524).

81395653244 is a wasteful number, since it uses less digits than its factorization.

81395653244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75088516 (or 75088514 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 50.

The spelling of 81395653244 in words is "eighty-one billion, three hundred ninety-five million, six hundred fifty-three thousand, two hundred forty-four".