81070805266 has 32 divisors (see below), whose sum is σ = 140503222080. Its totient is φ = 34673241600.

The previous prime is 81070805213. The next prime is 81070805281. The reversal of 81070805266 is 66250807018.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1441861 + ... + 1497031.

It is an arithmetic number, because the mean of its divisors is an integer number (4390725690).

Almost surely, 2^81070805266 is an apocalyptic number.

81070805266 is a deficient number, since it is larger than the sum of its proper divisors (59432416814).

81070805266 is a wasteful number, since it uses less digits than its factorization.

81070805266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59130.

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 81070805266 in words is "eighty-one billion, seventy million, eight hundred five thousand, two hundred sixty-six".