81738593547 has 8 divisors (see below), whose sum is σ = 117368236944. Its totient is φ = 50300672928.

The previous prime is 81738593543. The next prime is 81738593551. The reversal of 81738593547 is 74539583718.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81738593543) and next prime (81738593551).

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

It is not a de Polignac number, because 81738593547 - 2² = 81738593543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81738593543) 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 in 7 ways as a sum of consecutive naturals, for example, 1047930648 + ... + 1047930725.

It is an arithmetic number, because the mean of its divisors is an integer number (14671029618).

Almost surely, 2^81738593547 is an apocalyptic number.

81738593547 is a deficient number, since it is larger than the sum of its proper divisors (35629643397).

81738593547 is a wasteful number, since it uses less digits than its factorization.

81738593547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2095861389.

The product of its digits is 25401600, while the sum is 60.

The spelling of 81738593547 in words is "eighty-one billion, seven hundred thirty-eight million, five hundred ninety-three thousand, five hundred forty-seven".