81066499011 has 12 divisors (see below), whose sum is σ = 117110456320. Its totient is φ = 54037685520.

The previous prime is 81066499009. The next prime is 81066499027. The reversal of 81066499011 is 11099466018.

It is not a de Polignac number, because 81066499011 - 2¹ = 81066499009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81066499001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 476116 + ... + 623553.

Almost surely, 2^81066499011 is an apocalyptic number.

81066499011 is a deficient number, since it is larger than the sum of its proper divisors (36043957309).

81066499011 is a wasteful number, since it uses less digits than its factorization.

81066499011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107866 (or 1107863 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The spelling of 81066499011 in words is "eighty-one billion, sixty-six million, four hundred ninety-nine thousand, eleven".