27949869977 has 2 divisors, whose sum is σ = 27949869978. Its totient is φ = 27949869976.

The previous prime is 27949869971. The next prime is 27949870001. The reversal of 27949869977 is 77996894972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27843594496 + 106275481 = 166864^2 + 10309^2 .

It is a cyclic number.

It is not a de Polignac number, because 27949869977 - 2²⁰ = 27948821401 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27949869898 and 27949869907.

It is not a weakly prime, because it can be changed into another prime (27949869971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13974934988 + 13974934989.

It is an arithmetic number, because the mean of its divisors is an integer number (13974934989).

Almost surely, 2^27949869977 is an apocalyptic number.

It is an amenable number.

27949869977 is a deficient number, since it is larger than the sum of its proper divisors (1).

27949869977 is an equidigital number, since it uses as much as digits as its factorization.

27949869977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864162432, while the sum is 77.

The spelling of 27949869977 in words is "twenty-seven billion, nine hundred forty-nine million, eight hundred sixty-nine thousand, nine hundred seventy-seven".