27777675397 has 2 divisors, whose sum is σ = 27777675398. Its totient is φ = 27777675396.

The previous prime is 27777675383. The next prime is 27777675451. The reversal of 27777675397 is 79357677772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26165974081 + 1611701316 = 161759^2 + 40146^2 .

It is a cyclic number.

It is not a de Polignac number, because 27777675397 - 2⁷ = 27777675269 is a prime.

It is a super-2 number, since 2×27777675397² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27777675097) 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 as a sum of consecutive naturals, namely, 13888837698 + 13888837699.

It is an arithmetic number, because the mean of its divisors is an integer number (13888837699).

Almost surely, 2^27777675397 is an apocalyptic number.

It is an amenable number.

27777675397 is a deficient number, since it is larger than the sum of its proper divisors (1).

27777675397 is an equidigital number, since it uses as much as digits as its factorization.

27777675397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190591380, while the sum is 67.

The spelling of 27777675397 in words is "twenty-seven billion, seven hundred seventy-seven million, six hundred seventy-five thousand, three hundred ninety-seven".