27890266537765 has 4 divisors (see below), whose sum is σ = 33468319845324. Its totient is φ = 22312213230208.

The previous prime is 27890266537753. The next prime is 27890266537811. The reversal of 27890266537765 is 56773566209872.

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 13629077130564 + 14261189407201 = 3691758^2 + 3776399^2 .

It is a cyclic number.

It is not a de Polignac number, because 27890266537765 - 2⁹ = 27890266537253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2789026653772 + ... + 2789026653781.

It is an arithmetic number, because the mean of its divisors is an integer number (8367079961331).

Almost surely, 2^{27890266537765} is an apocalyptic number.

It is an amenable number.

27890266537765 is a deficient number, since it is larger than the sum of its proper divisors (5578053307559).

27890266537765 is an equidigital number, since it uses as much as digits as its factorization.

27890266537765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5578053307558.

The product of its (nonzero) digits is 1600300800, while the sum is 73.

The spelling of 27890266537765 in words is "twenty-seven trillion, eight hundred ninety billion, two hundred sixty-six million, five hundred thirty-seven thousand, seven hundred sixty-five".