27475987865 has 4 divisors (see below), whose sum is σ = 32971185444. Its totient is φ = 21980790288.

The previous prime is 27475987849. The next prime is 27475987867. The reversal of 27475987865 is 56878957472.

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 5008675984 + 22467311881 = 70772^2 + 149891^2 .

It is a cyclic number.

It is not a de Polignac number, because 27475987865 - 2⁴ = 27475987849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27475987795 and 27475987804.

It is not an unprimeable number, because it can be changed into a prime (27475987867) 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, 2747598782 + ... + 2747598791.

It is an arithmetic number, because the mean of its divisors is an integer number (8242796361).

Almost surely, 2^27475987865 is an apocalyptic number.

It is an amenable number.

27475987865 is a deficient number, since it is larger than the sum of its proper divisors (5495197579).

27475987865 is an equidigital number, since it uses as much as digits as its factorization.

27475987865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5495197578.

The product of its digits is 237081600, while the sum is 68.

The spelling of 27475987865 in words is "twenty-seven billion, four hundred seventy-five million, nine hundred eighty-seven thousand, eight hundred sixty-five".