81960472226 has 16 divisors (see below), whose sum is σ = 126310901496. Its totient is φ = 39857671296.

The previous prime is 81960472219. The next prime is 81960472241. The reversal of 81960472226 is 62227406918.

It can be written as a sum of positive squares in 4 ways, for example, as 60277615225 + 21682857001 = 245515^2 + 147251^2 .

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 7 ways as a sum of consecutive naturals, for example, 8771 + ... + 404966.

Almost surely, 2^81960472226 is an apocalyptic number.

81960472226 is a deficient number, since it is larger than the sum of its proper divisors (44350429270).

81960472226 is a wasteful number, since it uses less digits than its factorization.

81960472226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416453.

The product of its (nonzero) digits is 580608, while the sum is 47.

The spelling of 81960472226 in words is "eighty-one billion, nine hundred sixty million, four hundred seventy-two thousand, two hundred twenty-six".