27885805657 has 4 divisors (see below), whose sum is σ = 27970053136. Its totient is φ = 27801558180.

The previous prime is 27885805621. The next prime is 27885805663. The reversal of 27885805657 is 75650858872.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27885805657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27885805595 and 27885805604.

It is not an unprimeable number, because it can be changed into a prime (27885805667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42123243 + ... + 42123904.

It is an arithmetic number, because the mean of its divisors is an integer number (6992513284).

Almost surely, 2^27885805657 is an apocalyptic number.

It is an amenable number.

27885805657 is a deficient number, since it is larger than the sum of its proper divisors (84247479).

27885805657 is an equidigital number, since it uses as much as digits as its factorization.

27885805657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84247478.

The product of its (nonzero) digits is 37632000, while the sum is 61.

The spelling of 27885805657 in words is "twenty-seven billion, eight hundred eighty-five million, eight hundred five thousand, six hundred fifty-seven".