27747701851 has 4 divisors (see below), whose sum is σ = 27751900600. Its totient is φ = 27743503104.

The previous prime is 27747701833. The next prime is 27747701857. The reversal of 27747701851 is 15810774772.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27747701851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27747701795 and 27747701804.

It is not an unprimeable number, because it can be changed into a prime (27747701857) 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, 2089446 + ... + 2102683.

It is an arithmetic number, because the mean of its divisors is an integer number (6937975150).

Almost surely, 2^27747701851 is an apocalyptic number.

27747701851 is a deficient number, since it is larger than the sum of its proper divisors (4198749).

27747701851 is an equidigital number, since it uses as much as digits as its factorization.

27747701851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4198748.

The product of its (nonzero) digits is 768320, while the sum is 49.

The spelling of 27747701851 in words is "twenty-seven billion, seven hundred forty-seven million, seven hundred one thousand, eight hundred fifty-one".