81007950081 has 16 divisors (see below), whose sum is σ = 111790742400. Its totient is φ = 52117083648.

The previous prime is 81007950071. The next prime is 81007950083. The reversal of 81007950081 is 18005970018.

It is not a de Polignac number, because 81007950081 - 2⁹ = 81007949569 is a prime.

It is a super-2 number, since 2×81007950081² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81007950083) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 55341 + ... + 406298.

It is an arithmetic number, because the mean of its divisors is an integer number (6986921400).

Almost surely, 2^81007950081 is an apocalyptic number.

It is an amenable number.

81007950081 is a deficient number, since it is larger than the sum of its proper divisors (30782792319).

81007950081 is a wasteful number, since it uses less digits than its factorization.

81007950081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463688.

The product of its (nonzero) digits is 20160, while the sum is 39.

The spelling of 81007950081 in words is "eighty-one billion, seven million, nine hundred fifty thousand, eighty-one".