81448410357 has 16 divisors (see below), whose sum is σ = 120787102080. Its totient is φ = 54243684576.

The previous prime is 81448410349. The next prime is 81448410391. The reversal of 81448410357 is 75301484418.

81448410357 is a `hidden beast` number, since 8 + 14 + 484 + 103 + 57 = 666.

It is not a de Polignac number, because 81448410357 - 2³ = 81448410349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81448410257) 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, 1507848 + ... + 1560929.

It is an arithmetic number, because the mean of its divisors is an integer number (7549193880).

Almost surely, 2^81448410357 is an apocalyptic number.

It is an amenable number.

81448410357 is a deficient number, since it is larger than the sum of its proper divisors (39338691723).

81448410357 is a wasteful number, since it uses less digits than its factorization.

81448410357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3069769 (or 3069763 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The spelling of 81448410357 in words is "eighty-one billion, four hundred forty-eight million, four hundred ten thousand, three hundred fifty-seven".