66628841 has 2 divisors, whose sum is σ = 66628842. Its totient is φ = 66628840.

The previous prime is 66628799. The next prime is 66628853. The reversal of 66628841 is 14882666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34762816 + 31866025 = 5896^2 + 5645^2 .

It is a cyclic number.

It is not a de Polignac number, because 66628841 - 2¹⁴ = 66612457 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66628141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33314420 + 33314421.

It is an arithmetic number, because the mean of its divisors is an integer number (33314421).

Almost surely, 2^66628841 is an apocalyptic number.

It is an amenable number.

66628841 is a deficient number, since it is larger than the sum of its proper divisors (1).

66628841 is an equidigital number, since it uses as much as digits as its factorization.

66628841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 41.

The square root of 66628841 is about 8162.6491410571. The cubic root of 66628841 is about 405.4034307481.

The spelling of 66628841 in words is "sixty-six million, six hundred twenty-eight thousand, eight hundred forty-one".