81350770706 has 16 divisors (see below), whose sum is σ = 124339874904. Its totient is φ = 39904285824.

The previous prime is 81350770703. The next prime is 81350770717. The reversal of 81350770706 is 60707705318.

It can be written as a sum of positive squares in 4 ways, for example, as 24559591225 + 56791179481 = 156715^2 + 238309^2 .

It is not an unprimeable number, because it can be changed into a prime (81350770703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1414790 + ... + 1471166.

Almost surely, 2^81350770706 is an apocalyptic number.

81350770706 is a deficient number, since it is larger than the sum of its proper divisors (42989104198).

81350770706 is a wasteful number, since it uses less digits than its factorization.

81350770706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70045.

The product of its (nonzero) digits is 246960, while the sum is 44.

The spelling of 81350770706 in words is "eighty-one billion, three hundred fifty million, seven hundred seventy thousand, seven hundred six".