81050304069 has 24 divisors (see below), whose sum is σ = 133848416832. Its totient is φ = 46296774720.

The previous prime is 81050304067. The next prime is 81050304089. The reversal of 81050304069 is 96040305018.

It is not a de Polignac number, because 81050304069 - 2¹ = 81050304067 is a prime.

It is a super-4 number, since 4×81050304069⁴ (a number of 45 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81050304067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78427 + ... + 410184.

It is an arithmetic number, because the mean of its divisors is an integer number (5577017368).

Almost surely, 2^81050304069 is an apocalyptic number.

It is an amenable number.

81050304069 is a deficient number, since it is larger than the sum of its proper divisors (52798112763).

81050304069 is a wasteful number, since it uses less digits than its factorization.

81050304069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491257 (or 491254 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 81050304069 in words is "eighty-one billion, fifty million, three hundred four thousand, sixty-nine".