81296123291448 has 64 divisors (see below), whose sum is σ = 218875766578560. Its totient is φ = 25014010240896.

The previous prime is 81296123291389. The next prime is 81296123291521. The reversal of 81296123291448 is 84419232169218.

It is a junction number, because it is equal to n+sod(n) for n = 81296123291391 and 81296123291400.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45812911 + ... + 47554337.

It is an arithmetic number, because the mean of its divisors is an integer number (3419933852790).

Almost surely, 2^{81296123291448} is an apocalyptic number.

It is an amenable number.

81296123291448 is an abundant number, since it is smaller than the sum of its proper divisors (137579643287112).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81296123291448 is a wasteful number, since it uses less digits than its factorization.

81296123291448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1891076 (or 1891072 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 60.

The spelling of 81296123291448 in words is "eighty-one trillion, two hundred ninety-six billion, one hundred twenty-three million, two hundred ninety-one thousand, four hundred forty-eight".