81208047344 has 10 divisors (see below), whose sum is σ = 157340591760. Its totient is φ = 40604023664.

The previous prime is 81208047331. The next prime is 81208047353. The reversal of 81208047344 is 44374080218.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2537751464 + ... + 2537751495.

It is an arithmetic number, because the mean of its divisors is an integer number (15734059176).

Almost surely, 2^81208047344 is an apocalyptic number.

It is an amenable number.

81208047344 is a deficient number, since it is larger than the sum of its proper divisors (76132544416).

81208047344 is a wasteful number, since it uses less digits than its factorization.

81208047344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5075502967 (or 5075502961 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 41.

The spelling of 81208047344 in words is "eighty-one billion, two hundred eight million, forty-seven thousand, three hundred forty-four".