81065052777 has 4 divisors (see below), whose sum is σ = 108086737040. Its totient is φ = 54043368516.

The previous prime is 81065052773. The next prime is 81065052833. The reversal of 81065052777 is 77725056018.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 81065052777 - 2² = 81065052773 is a prime.

It is a super-3 number, since 3×81065052777³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81065052773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13510842127 + ... + 13510842132.

It is an arithmetic number, because the mean of its divisors is an integer number (27021684260).

Almost surely, 2^81065052777 is an apocalyptic number.

It is an amenable number.

81065052777 is a deficient number, since it is larger than the sum of its proper divisors (27021684263).

81065052777 is a wasteful number, since it uses less digits than its factorization.

81065052777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27021684262.

The product of its (nonzero) digits is 823200, while the sum is 48.

The spelling of 81065052777 in words is "eighty-one billion, sixty-five million, fifty-two thousand, seven hundred seventy-seven".