27887725394465 has 4 divisors (see below), whose sum is σ = 33465270473364. Its totient is φ = 22310180315568.

The previous prime is 27887725394449. The next prime is 27887725394471. The reversal of 27887725394465 is 56449352778872.

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 6266350679824 + 21621374714641 = 2503268^2 + 4649879^2 .

It is a cyclic number.

It is not a de Polignac number, because 27887725394465 - 2⁴ = 27887725394449 is a prime.

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, 2788772539442 + ... + 2788772539451.

It is an arithmetic number, because the mean of its divisors is an integer number (8366317618341).

Almost surely, 2^{27887725394465} is an apocalyptic number.

It is an amenable number.

27887725394465 is a deficient number, since it is larger than the sum of its proper divisors (5577545078899).

27887725394465 is an equidigital number, since it uses as much as digits as its factorization.

27887725394465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5577545078898.

The product of its digits is 5689958400, while the sum is 77.

The spelling of 27887725394465 in words is "twenty-seven trillion, eight hundred eighty-seven billion, seven hundred twenty-five million, three hundred ninety-four thousand, four hundred sixty-five".