81548328907 has 2 divisors, whose sum is σ = 81548328908. Its totient is φ = 81548328906.

The previous prime is 81548328887. The next prime is 81548328989. The reversal of 81548328907 is 70982384518.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81548328907 - 2²⁷ = 81414111179 is a prime.

It is not a weakly prime, because it can be changed into another prime (81548328997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40774164453 + 40774164454.

It is an arithmetic number, because the mean of its divisors is an integer number (40774164454).

Almost surely, 2^81548328907 is an apocalyptic number.

81548328907 is a deficient number, since it is larger than the sum of its proper divisors (1).

81548328907 is an equidigital number, since it uses as much as digits as its factorization.

81548328907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3870720, while the sum is 55.

The spelling of 81548328907 in words is "eighty-one billion, five hundred forty-eight million, three hundred twenty-eight thousand, nine hundred seven".