81448500075 has 24 divisors (see below), whose sum is σ = 134670510000. Its totient is φ = 43436300160.

The previous prime is 81448500037. The next prime is 81448500157. The reversal of 81448500075 is 57000584418.

It is not a de Polignac number, because 81448500075 - 2¹⁴ = 81448483691 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1560501 + ... + 1611849.

It is an arithmetic number, because the mean of its divisors is an integer number (5611271250).

Almost surely, 2^81448500075 is an apocalyptic number.

81448500075 is a deficient number, since it is larger than the sum of its proper divisors (53222009925).

81448500075 is a wasteful number, since it uses less digits than its factorization.

81448500075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72511 (or 72506 counting only the distinct ones).

The product of its (nonzero) digits is 179200, while the sum is 42.

The spelling of 81448500075 in words is "eighty-one billion, four hundred forty-eight million, five hundred thousand, seventy-five".