81688192104441 has 32 divisors (see below), whose sum is σ = 121085046512640. Its totient is φ = 48645867801600.

The previous prime is 81688192104437. The next prime is 81688192104559. The reversal of 81688192104441 is 14440129188618.

It is a happy number.

It is not a de Polignac number, because 81688192104441 - 2² = 81688192104437 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81688192104041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25584901 + ... + 28600061.

It is an arithmetic number, because the mean of its divisors is an integer number (3783907703520).

Almost surely, 2^{81688192104441} is an apocalyptic number.

It is an amenable number.

81688192104441 is a deficient number, since it is larger than the sum of its proper divisors (39396854408199).

81688192104441 is a wasteful number, since it uses less digits than its factorization.

81688192104441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3037617.

The product of its (nonzero) digits is 3538944, while the sum is 57.

The spelling of 81688192104441 in words is "eighty-one trillion, six hundred eighty-eight billion, one hundred ninety-two million, one hundred four thousand, four hundred forty-one".