55065581 has 2 divisors, whose sum is σ = 55065582. Its totient is φ = 55065580.

The previous prime is 55065559. The next prime is 55065587. The reversal of 55065581 is 18556055.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44009956 + 11055625 = 6634^2 + 3325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55065581 is a prime.

It is a super-2 number, since 2×55065581² = 6064436421735122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55065587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27532790 + 27532791.

It is an arithmetic number, because the mean of its divisors is an integer number (27532791).

Almost surely, 2^55065581 is an apocalyptic number.

It is an amenable number.

55065581 is a deficient number, since it is larger than the sum of its proper divisors (1).

55065581 is an equidigital number, since it uses as much as digits as its factorization.

55065581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30000, while the sum is 35.

The square root of 55065581 is about 7420.6186399787. The cubic root of 55065581 is about 380.4463384178.

The spelling of 55065581 in words is "fifty-five million, sixty-five thousand, five hundred eighty-one".