81448545464773 has 8 divisors (see below), whose sum is σ = 83349401577728. Its totient is φ = 79547994074304.

The previous prime is 81448545464701. The next prime is 81448545464779. The reversal of 81448545464773 is 37746454584418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81448545464773 - 2¹³ = 81448545456581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81448545464779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75639765 + ... + 76709002.

It is an arithmetic number, because the mean of its divisors is an integer number (10418675197216).

Almost surely, 2^{81448545464773} is an apocalyptic number.

It is an amenable number.

81448545464773 is a deficient number, since it is larger than the sum of its proper divisors (1900856112955).

81448545464773 is a wasteful number, since it uses less digits than its factorization.

81448545464773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152361243.

The product of its digits is 1445068800, while the sum is 70.

The spelling of 81448545464773 in words is "eighty-one trillion, four hundred forty-eight billion, five hundred forty-five million, four hundred sixty-four thousand, seven hundred seventy-three".