55381860726109 has 2 divisors, whose sum is σ = 55381860726110. Its totient is φ = 55381860726108.

The previous prime is 55381860726103. The next prime is 55381860726217. The reversal of 55381860726109 is 90162706818355.

55381860726109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52403164434009 + 2978696292100 = 7239003^2 + 1725890^2 .

It is a cyclic number.

It is not a de Polignac number, because 55381860726109 - 2³⁵ = 55347500987741 is a prime.

It is a super-4 number, since 4×55381860726109⁴ (a number of 56 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3, 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55381860726103) 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, 27690930363054 + 27690930363055.

It is an arithmetic number, because the mean of its divisors is an integer number (27690930363055).

Almost surely, 2^{55381860726109} is an apocalyptic number.

It is an amenable number.

55381860726109 is a deficient number, since it is larger than the sum of its proper divisors (1).

55381860726109 is an equidigital number, since it uses as much as digits as its factorization.

55381860726109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21772800, while the sum is 61.

The spelling of 55381860726109 in words is "fifty-five trillion, three hundred eighty-one billion, eight hundred sixty million, seven hundred twenty-six thousand, one hundred nine".