54778543117 has 2 divisors, whose sum is σ = 54778543118. Its totient is φ = 54778543116.

The previous prime is 54778543067. The next prime is 54778543129. The reversal of 54778543117 is 71134587745.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52480395396 + 2298147721 = 229086^2 + 47939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54778543117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54778541117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27389271558 + 27389271559.

It is an arithmetic number, because the mean of its divisors is an integer number (27389271559).

Almost surely, 2^54778543117 is an apocalyptic number.

It is an amenable number.

54778543117 is a deficient number, since it is larger than the sum of its proper divisors (1).

54778543117 is an equidigital number, since it uses as much as digits as its factorization.

54778543117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3292800, while the sum is 52.

The spelling of 54778543117 in words is "fifty-four billion, seven hundred seventy-eight million, five hundred forty-three thousand, one hundred seventeen".