81019752226 has 32 divisors (see below), whose sum is σ = 147262008960. Its totient is φ = 32635581696.

The previous prime is 81019752223. The next prime is 81019752227. The reversal of 81019752226 is 62225791018.

It is not an unprimeable number, because it can be changed into a prime (81019752223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57756 + ... + 406663.

It is an arithmetic number, because the mean of its divisors is an integer number (4601937780).

Almost surely, 2^81019752226 is an apocalyptic number.

81019752226 is a deficient number, since it is larger than the sum of its proper divisors (66242256734).

81019752226 is a wasteful number, since it uses less digits than its factorization.

81019752226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465178.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 81019752226 in words is "eighty-one billion, nineteen million, seven hundred fifty-two thousand, two hundred twenty-six".