81290181796 has 12 divisors (see below), whose sum is σ = 142263082780. Its totient is φ = 40643586720.

The previous prime is 81290181701. The next prime is 81290181803. The reversal of 81290181796 is 69718109218.

It can be written as a sum of positive squares in 2 ways, for example, as 51615296100 + 29674885696 = 227190^2 + 172264^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 249735 + ... + 474286.

Almost surely, 2^81290181796 is an apocalyptic number.

It is an amenable number.

81290181796 is a deficient number, since it is larger than the sum of its proper divisors (60972900984).

81290181796 is a wasteful number, since it uses less digits than its factorization.

81290181796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752094 (or 752092 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 52.

The spelling of 81290181796 in words is "eighty-one billion, two hundred ninety million, one hundred eighty-one thousand, seven hundred ninety-six".