66554941 has 2 divisors, whose sum is σ = 66554942. Its totient is φ = 66554940.

The previous prime is 66554921. The next prime is 66554951. The reversal of 66554941 is 14945566.

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., 61559716 + 4995225 = 7846^2 + 2235^2 .

It is a cyclic number.

It is not a de Polignac number, because 66554941 - 2⁹ = 66554429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66554894 and 66554903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66554921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33277470 + 33277471.

It is an arithmetic number, because the mean of its divisors is an integer number (33277471).

Almost surely, 2^66554941 is an apocalyptic number.

It is an amenable number.

66554941 is a deficient number, since it is larger than the sum of its proper divisors (1).

66554941 is an equidigital number, since it uses as much as digits as its factorization.

66554941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 40.

The square root of 66554941 is about 8158.1211685044. The cubic root of 66554941 is about 405.2534936930.

The spelling of 66554941 in words is "sixty-six million, five hundred fifty-four thousand, nine hundred forty-one".