54778543129 has 2 divisors, whose sum is σ = 54778543130. Its totient is φ = 54778543128.

The previous prime is 54778543117. The next prime is 54778543181. The reversal of 54778543129 is 92134587745.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53662649104 + 1115894025 = 231652^2 + 33405^2 .

It is a cyclic number.

It is not a de Polignac number, because 54778543129 - 2⁹ = 54778542617 is a prime.

It is a super-2 number, since 2×54778543129² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 54778543129.

It is not a weakly prime, because it can be changed into another prime (54778543229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27389271564 + 27389271565.

It is an arithmetic number, because the mean of its divisors is an integer number (27389271565).

Almost surely, 2^54778543129 is an apocalyptic number.

It is an amenable number.

54778543129 is a deficient number, since it is larger than the sum of its proper divisors (1).

54778543129 is an equidigital number, since it uses as much as digits as its factorization.

54778543129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8467200, while the sum is 55.

The spelling of 54778543129 in words is "fifty-four billion, seven hundred seventy-eight million, five hundred forty-three thousand, one hundred twenty-nine".