28081065814465 has 4 divisors (see below), whose sum is σ = 33697278977364. Its totient is φ = 22464852651568.

The previous prime is 28081065814453. The next prime is 28081065814507. The reversal of 28081065814465 is 56441856018082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8646757848369 + 19434307966096 = 2940537^2 + 4408436^2 .

It is a cyclic number.

It is not a de Polignac number, because 28081065814465 - 2³¹ = 28078918330817 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2808106581442 + ... + 2808106581451.

It is an arithmetic number, because the mean of its divisors is an integer number (8424319744341).

Almost surely, 2^{28081065814465} is an apocalyptic number.

It is an amenable number.

28081065814465 is a deficient number, since it is larger than the sum of its proper divisors (5616213162899).

28081065814465 is an equidigital number, since it uses as much as digits as its factorization.

28081065814465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5616213162898.

The product of its (nonzero) digits is 14745600, while the sum is 58.

The spelling of 28081065814465 in words is "twenty-eight trillion, eighty-one billion, sixty-five million, eight hundred fourteen thousand, four hundred sixty-five".