81246440448 has 88 divisors (see below), whose sum is σ = 240612731760. Its totient is φ = 27082137600.

The previous prime is 81246440441. The next prime is 81246440507. The reversal of 81246440448 is 84404464218.

It is not an unprimeable number, because it can be changed into a prime (81246440441) 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, 1441653 + ... + 1496948.

Almost surely, 2^81246440448 is an apocalyptic number.

It is an amenable number.

81246440448 is an abundant number, since it is smaller than the sum of its proper divisors (159366291312).

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

81246440448 is a wasteful number, since it uses less digits than its factorization.

81246440448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2938630 (or 2938606 counting only the distinct ones).

The product of its (nonzero) digits is 786432, while the sum is 45.

The spelling of 81246440448 in words is "eighty-one billion, two hundred forty-six million, four hundred forty thousand, four hundred forty-eight".