81748009609 has 8 divisors (see below), whose sum is σ = 93525588288. Its totient is φ = 69995253840.

The previous prime is 81748009583. The next prime is 81748009631. The reversal of 81748009609 is 90690084718.

It is a happy number.

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 81748009609 - 2²⁷ = 81613791881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81748009699) 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, 6198667 + ... + 6211840.

It is an arithmetic number, because the mean of its divisors is an integer number (11690698536).

Almost surely, 2^81748009609 is an apocalyptic number.

It is an amenable number.

81748009609 is a deficient number, since it is larger than the sum of its proper divisors (11777578679).

81748009609 is a wasteful number, since it uses less digits than its factorization.

81748009609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12411455.

The product of its (nonzero) digits is 870912, while the sum is 52.

The spelling of 81748009609 in words is "eighty-one billion, seven hundred forty-eight million, nine thousand, six hundred nine".