81208047318 has 128 divisors (see below), whose sum is σ = 175874457600. Its totient is φ = 24936586752.

The previous prime is 81208047317. The next prime is 81208047331. The reversal of 81208047318 is 81374080218.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81208047318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81208047317) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 131192013 + ... + 131192631.

It is an arithmetic number, because the mean of its divisors is an integer number (1374019200).

Almost surely, 2^81208047318 is an apocalyptic number.

81208047318 is an abundant number, since it is smaller than the sum of its proper divisors (94666410282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81208047318 is a wasteful number, since it uses less digits than its factorization.

81208047318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986.

The product of its (nonzero) digits is 86016, while the sum is 42.

The spelling of 81208047318 in words is "eighty-one billion, two hundred eight million, forty-seven thousand, three hundred eighteen".