81130669009 has 64 divisors (see below), whose sum is σ = 95869992960. Its totient is φ = 68016291840.

The previous prime is 81130669003. The next prime is 81130669043. The reversal of 81130669009 is 90096603118.

It is a cyclic number.

It is not a de Polignac number, because 81130669009 - 2⁵ = 81130668977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81130669003) 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 63 ways as a sum of consecutive naturals, for example, 211829232 + ... + 211829614.

It is an arithmetic number, because the mean of its divisors is an integer number (1497968640).

Almost surely, 2^81130669009 is an apocalyptic number.

It is an amenable number.

81130669009 is a deficient number, since it is larger than the sum of its proper divisors (14739323951).

81130669009 is a wasteful number, since it uses less digits than its factorization.

81130669009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790.

The product of its (nonzero) digits is 69984, while the sum is 43.

The spelling of 81130669009 in words is "eighty-one billion, one hundred thirty million, six hundred sixty-nine thousand, nine".