27956388865 has 8 divisors (see below), whose sum is σ = 33549888960. Its totient is φ = 22363629552.

The previous prime is 27956388851. The next prime is 27956388869. The reversal of 27956388865 is 56888365972.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27956388865 - 2⁹ = 27956388353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27956388865.

It is not an unprimeable number, because it can be changed into a prime (27956388869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98475 + ... + 256144.

It is an arithmetic number, because the mean of its divisors is an integer number (4193736120).

Almost surely, 2^27956388865 is an apocalyptic number.

It is an amenable number.

27956388865 is a deficient number, since it is larger than the sum of its proper divisors (5593500095).

27956388865 is a wasteful number, since it uses less digits than its factorization.

27956388865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370391.

The product of its digits is 174182400, while the sum is 67.

The spelling of 27956388865 in words is "twenty-seven billion, nine hundred fifty-six million, three hundred eighty-eight thousand, eight hundred sixty-five".