81471748118 has 8 divisors (see below), whose sum is σ = 122491167840. Its totient is φ = 40641358840.

The previous prime is 81471748097. The next prime is 81471748121. The reversal of 81471748118 is 81184717418.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47256533 + ... + 47258256.

It is an arithmetic number, because the mean of its divisors is an integer number (15311395980).

Almost surely, 2^81471748118 is an apocalyptic number.

81471748118 is a deficient number, since it is larger than the sum of its proper divisors (41019419722).

81471748118 is a wasteful number, since it uses less digits than its factorization.

81471748118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94515222.

The product of its digits is 401408, while the sum is 50.

The spelling of 81471748118 in words is "eighty-one billion, four hundred seventy-one million, seven hundred forty-eight thousand, one hundred eighteen".