27758778651 has 12 divisors (see below), whose sum is σ = 41581051512. Its totient is φ = 18505852272.

The previous prime is 27758778629. The next prime is 27758778679. The reversal of 27758778651 is 15687785772.

It is not a de Polignac number, because 27758778651 - 2²¹ = 27756681499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27758778611) 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 11 ways as a sum of consecutive naturals, for example, 57116586 + ... + 57117071.

It is an arithmetic number, because the mean of its divisors is an integer number (3465087626).

Almost surely, 2^27758778651 is an apocalyptic number.

27758778651 is a deficient number, since it is larger than the sum of its proper divisors (13822272861).

27758778651 is an equidigital number, since it uses as much as digits as its factorization.

27758778651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114233672 (or 114233660 counting only the distinct ones).

The product of its digits is 46099200, while the sum is 63.

The spelling of 27758778651 in words is "twenty-seven billion, seven hundred fifty-eight million, seven hundred seventy-eight thousand, six hundred fifty-one".