27777777541 has 2 divisors, whose sum is σ = 27777777542. Its totient is φ = 27777777540.

The previous prime is 27777777473. The next prime is 27777777661. The reversal of 27777777541 is 14577777772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26529568641 + 1248208900 = 162879^2 + 35330^2 .

It is a cyclic number.

It is not a de Polignac number, because 27777777541 - 2⁷ = 27777777413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27777777541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27778777541) 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, 13888888770 + 13888888771.

It is an arithmetic number, because the mean of its divisors is an integer number (13888888771).

Almost surely, 2^27777777541 is an apocalyptic number.

It is an amenable number.

27777777541 is a deficient number, since it is larger than the sum of its proper divisors (1).

27777777541 is an equidigital number, since it uses as much as digits as its factorization.

27777777541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32941720, while the sum is 61.

The spelling of 27777777541 in words is "twenty-seven billion, seven hundred seventy-seven million, seven hundred seventy-seven thousand, five hundred forty-one".