27805866667 has 4 divisors (see below), whose sum is σ = 27982974256. Its totient is φ = 27628759080.

The previous prime is 27805866661. The next prime is 27805866677. The reversal of 27805866667 is 76666850872.

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

It is a cyclic number.

It is not a de Polignac number, because 27805866667 - 2¹⁹ = 27805342379 is a prime.

It is a super-2 number, since 2×27805866667² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27805866661) 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, 88553559 + ... + 88553872.

It is an arithmetic number, because the mean of its divisors is an integer number (6995743564).

Almost surely, 2^27805866667 is an apocalyptic number.

27805866667 is a deficient number, since it is larger than the sum of its proper divisors (177107589).

27805866667 is a wasteful number, since it uses less digits than its factorization.

27805866667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177107588.

The product of its (nonzero) digits is 40642560, while the sum is 61.

The spelling of 27805866667 in words is "twenty-seven billion, eight hundred five million, eight hundred sixty-six thousand, six hundred sixty-seven".