81384416770 has 8 divisors (see below), whose sum is σ = 146491950204. Its totient is φ = 32553766704.

The previous prime is 81384416767. The next prime is 81384416809. The reversal of 81384416770 is 7761448318.

It can be written as a sum of positive squares in 2 ways, for example, as 80695196761 + 689220009 = 284069^2 + 26253^2 .

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

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 in 3 ways as a sum of consecutive naturals, for example, 4069220829 + ... + 4069220848.

Almost surely, 2^81384416770 is an apocalyptic number.

81384416770 is a deficient number, since it is larger than the sum of its proper divisors (65107533434).

81384416770 is a wasteful number, since it uses less digits than its factorization.

81384416770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8138441684.

The product of its (nonzero) digits is 903168, while the sum is 49.

The spelling of 81384416770 in words is "eighty-one billion, three hundred eighty-four million, four hundred sixteen thousand, seven hundred seventy".