55065120155581 has 2 divisors, whose sum is σ = 55065120155582. Its totient is φ = 55065120155580.

The previous prime is 55065120155569. The next prime is 55065120155657. The reversal of 55065120155581 is 18555102156055.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54083286889956 + 981833265625 = 7354134^2 + 990875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55065120155581 is a prime.

It is a super-2 number, since 2×55065120155581² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55065121155581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27532560077790 + 27532560077791.

It is an arithmetic number, because the mean of its divisors is an integer number (27532560077791).

Almost surely, 2^{55065120155581} is an apocalyptic number.

It is an amenable number.

55065120155581 is a deficient number, since it is larger than the sum of its proper divisors (1).

55065120155581 is an equidigital number, since it uses as much as digits as its factorization.

55065120155581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1500000, while the sum is 49.

The spelling of 55065120155581 in words is "fifty-five trillion, sixty-five billion, one hundred twenty million, one hundred fifty-five thousand, five hundred eighty-one".