77857186133149 has 2 divisors, whose sum is σ = 77857186133150. Its totient is φ = 77857186133148.

The previous prime is 77857186133107. The next prime is 77857186133159. The reversal of 77857186133149 is 94133168175877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77813251877124 + 43934256025 = 8821182^2 + 209605^2 .

It is a cyclic number.

It is not a de Polignac number, because 77857186133149 - 2¹⁹ = 77857185608861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77857186133159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38928593066574 + 38928593066575.

It is an arithmetic number, because the mean of its divisors is an integer number (38928593066575).

Almost surely, 2^{77857186133149} is an apocalyptic number.

It is an amenable number.

77857186133149 is a deficient number, since it is larger than the sum of its proper divisors (1).

77857186133149 is an equidigital number, since it uses as much as digits as its factorization.

77857186133149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 213373440, while the sum is 70.

The spelling of 77857186133149 in words is "seventy-seven trillion, eight hundred fifty-seven billion, one hundred eighty-six million, one hundred thirty-three thousand, one hundred forty-nine".