81548328897 has 48 divisors (see below), whose sum is σ = 136125505152. Its totient is φ = 46078905600.

The previous prime is 81548328887. The next prime is 81548328907. The reversal of 81548328897 is 79882384518.

81548328897 is a `hidden beast` number, since 8 + 1 + 548 + 3 + 2 + 8 + 89 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (81548328887) and next prime (81548328907).

It is not a de Polignac number, because 81548328897 - 2⁷ = 81548328769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (81548328817) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5254453 + ... + 5269949.

It is an arithmetic number, because the mean of its divisors is an integer number (2835948024).

Almost surely, 2^81548328897 is an apocalyptic number.

It is an amenable number.

81548328897 is a deficient number, since it is larger than the sum of its proper divisors (54577176255).

81548328897 is a wasteful number, since it uses less digits than its factorization.

81548328897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16438 (or 16435 counting only the distinct ones).

The product of its digits is 30965760, while the sum is 63.

The spelling of 81548328897 in words is "eighty-one billion, five hundred forty-eight million, three hundred twenty-eight thousand, eight hundred ninety-seven".