81099068949 has 12 divisors (see below), whose sum is σ = 117149175936. Its totient is φ = 54063241512.

The previous prime is 81099068929. The next prime is 81099068957. The reversal of 81099068949 is 94986099018.

It is not a de Polignac number, because 81099068949 - 2⁵ = 81099068917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81099068929) 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 11 ways as a sum of consecutive naturals, for example, 42309 + ... + 404954.

It is an arithmetic number, because the mean of its divisors is an integer number (9762431328).

Almost surely, 2^81099068949 is an apocalyptic number.

It is an amenable number.

81099068949 is a deficient number, since it is larger than the sum of its proper divisors (36050106987).

81099068949 is a wasteful number, since it uses less digits than its factorization.

81099068949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467416 (or 467413 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 63.

The spelling of 81099068949 in words is "eighty-one billion, ninety-nine million, sixty-eight thousand, nine hundred forty-nine".