81373002447 has 16 divisors (see below), whose sum is σ = 118384152192. Its totient is φ = 49307212320.

The previous prime is 81373002439. The next prime is 81373002497. The reversal of 81373002447 is 74420037318.

It is not a de Polignac number, because 81373002447 - 2³ = 81373002439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81373002437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72888 + ... + 409949.

It is an arithmetic number, because the mean of its divisors is an integer number (7399009512).

Almost surely, 2^81373002447 is an apocalyptic number.

81373002447 is a deficient number, since it is larger than the sum of its proper divisors (37011149745).

81373002447 is a wasteful number, since it uses less digits than its factorization.

81373002447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487958.

The product of its (nonzero) digits is 112896, while the sum is 39.

The spelling of 81373002447 in words is "eighty-one billion, three hundred seventy-three million, two thousand, four hundred forty-seven".