81419776448 has 56 divisors (see below), whose sum is σ = 172609459200. Its totient is φ = 37991593728.

The previous prime is 81419776411. The next prime is 81419776469. The reversal of 81419776448 is 84467791418.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 418208 + ... + 581151.

Almost surely, 2^81419776448 is an apocalyptic number.

It is an amenable number.

81419776448 is an abundant number, since it is smaller than the sum of its proper divisors (91189682752).

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

81419776448 is a wasteful number, since it uses less digits than its factorization.

81419776448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999457 (or 999447 counting only the distinct ones).

The product of its digits is 10838016, while the sum is 59.

The spelling of 81419776448 in words is "eighty-one billion, four hundred nineteen million, seven hundred seventy-six thousand, four hundred forty-eight".