27768687851 has 4 divisors (see below), whose sum is σ = 28223912304. Its totient is φ = 27313463400.

The previous prime is 27768687847. The next prime is 27768687857. The reversal of 27768687851 is 15878686772.

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 27768687851 - 2² = 27768687847 is a prime.

It is a super-2 number, since 2×27768687851² (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 (27768687857) 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, 227612135 + ... + 227612256.

It is an arithmetic number, because the mean of its divisors is an integer number (7055978076).

Almost surely, 2^27768687851 is an apocalyptic number.

27768687851 is a deficient number, since it is larger than the sum of its proper divisors (455224453).

27768687851 is an equidigital number, since it uses as much as digits as its factorization.

27768687851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455224452.

The product of its digits is 63221760, while the sum is 65.

The spelling of 27768687851 in words is "twenty-seven billion, seven hundred sixty-eight million, six hundred eighty-seven thousand, eight hundred fifty-one".