55381860726217 has 2 divisors, whose sum is σ = 55381860726218. Its totient is φ = 55381860726216.

The previous prime is 55381860726109. The next prime is 55381860726299. The reversal of 55381860726217 is 71262706818355.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55381860726201 + 16 = 7441899^2 + 4^2 .

It is a cyclic number.

It is not a de Polignac number, because 55381860726217 - 2³¹ = 55379713242569 is a prime.

It is a super-2 number, since 2×55381860726217² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55381860726317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27690930363108 + 27690930363109.

It is an arithmetic number, because the mean of its divisors is an integer number (27690930363109).

Almost surely, 2^{55381860726217} is an apocalyptic number.

It is an amenable number.

55381860726217 is a deficient number, since it is larger than the sum of its proper divisors (1).

55381860726217 is an equidigital number, since it uses as much as digits as its factorization.

55381860726217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33868800, while the sum is 61.

The spelling of 55381860726217 in words is "fifty-five trillion, three hundred eighty-one billion, eight hundred sixty million, seven hundred twenty-six thousand, two hundred seventeen".