81458755265 has 8 divisors (see below), whose sum is σ = 97776969000. Its totient is φ = 65149362432.

The previous prime is 81458755249. The next prime is 81458755277. The reversal of 81458755265 is 56255785418.

It can be written as a sum of positive squares in 4 ways, for example, as 8130989584 + 73327765681 = 90172^2 + 270791^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81458755265 - 2⁴ = 81458755249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81458755265.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2184890 + ... + 2221859.

It is an arithmetic number, because the mean of its divisors is an integer number (12222121125).

Almost surely, 2^81458755265 is an apocalyptic number.

It is an amenable number.

81458755265 is a deficient number, since it is larger than the sum of its proper divisors (16318213735).

81458755265 is a wasteful number, since it uses less digits than its factorization.

81458755265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4410451.

The product of its digits is 13440000, while the sum is 56.

The spelling of 81458755265 in words is "eighty-one billion, four hundred fifty-eight million, seven hundred fifty-five thousand, two hundred sixty-five".