81008164226 has 32 divisors (see below), whose sum is σ = 134838043200. Its totient is φ = 36191232000.

The previous prime is 81008164219. The next prime is 81008164243. The reversal of 81008164226 is 62246180018.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 81008164226.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 600626 + ... + 723026.

It is an arithmetic number, because the mean of its divisors is an integer number (4213688850).

Almost surely, 2^81008164226 is an apocalyptic number.

81008164226 is a deficient number, since it is larger than the sum of its proper divisors (53829878974).

81008164226 is a wasteful number, since it uses less digits than its factorization.

81008164226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122930.

The product of its (nonzero) digits is 36864, while the sum is 38.

The spelling of 81008164226 in words is "eighty-one billion, eight million, one hundred sixty-four thousand, two hundred twenty-six".