81659401481468 has 12 divisors (see below), whose sum is σ = 144712863385440. Its totient is φ = 40312869085632.

The previous prime is 81659401481467. The next prime is 81659401481597. The reversal of 81659401481468 is 86418410495618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81659401481467) 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, 129207913421 + ... + 129207914052.

It is an arithmetic number, because the mean of its divisors is an integer number (12059405282120).

Almost surely, 2^{81659401481468} is an apocalyptic number.

It is an amenable number.

81659401481468 is a deficient number, since it is larger than the sum of its proper divisors (63053461903972).

81659401481468 is a wasteful number, since it uses less digits than its factorization.

81659401481468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258415827556 (or 258415827554 counting only the distinct ones).

The product of its (nonzero) digits is 53084160, while the sum is 65.

The spelling of 81659401481468 in words is "eighty-one trillion, six hundred fifty-nine billion, four hundred one million, four hundred eighty-one thousand, four hundred sixty-eight".