81548189067 has 8 divisors (see below), whose sum is σ = 108745482960. Its totient is φ = 54358177280.

The previous prime is 81548189057. The next prime is 81548189071. The reversal of 81548189067 is 76098184518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81548189067 - 2³⁶ = 12828712331 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81548188998 and 81548189016.

It is not an unprimeable number, because it can be changed into a prime (81548189017) 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, 1794342 + ... + 1839227.

It is an arithmetic number, because the mean of its divisors is an integer number (13593185370).

Almost surely, 2^81548189067 is an apocalyptic number.

81548189067 is a deficient number, since it is larger than the sum of its proper divisors (27197293893).

81548189067 is a wasteful number, since it uses less digits than its factorization.

81548189067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3641053.

The product of its (nonzero) digits is 3870720, while the sum is 57.

The spelling of 81548189067 in words is "eighty-one billion, five hundred forty-eight million, one hundred eighty-nine thousand, sixty-seven".