27777280477 has 2 divisors, whose sum is σ = 27777280478. Its totient is φ = 27777280476.

The previous prime is 27777280463. The next prime is 27777280483. The reversal of 27777280477 is 77408277772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23390337721 + 4386942756 = 152939^2 + 66234^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27777280477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27777280777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13888640238 + 13888640239.

It is an arithmetic number, because the mean of its divisors is an integer number (13888640239).

Almost surely, 2^27777280477 is an apocalyptic number.

It is an amenable number.

27777280477 is a deficient number, since it is larger than the sum of its proper divisors (1).

27777280477 is an equidigital number, since it uses as much as digits as its factorization.

27777280477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15059072, while the sum is 58.

The spelling of 27777280477 in words is "twenty-seven billion, seven hundred seventy-seven million, two hundred eighty thousand, four hundred seventy-seven".