66255121 has 2 divisors, whose sum is σ = 66255122. Its totient is φ = 66255120.

The previous prime is 66255107. The next prime is 66255127. The reversal of 66255121 is 12155266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47114496 + 19140625 = 6864^2 + 4375^2 .

It is a cyclic number.

It is not a de Polignac number, because 66255121 - 2⁹ = 66254609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66255121.

It is not a weakly prime, because it can be changed into another prime (66255127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33127560 + 33127561.

It is an arithmetic number, because the mean of its divisors is an integer number (33127561).

Almost surely, 2^66255121 is an apocalyptic number.

It is an amenable number.

66255121 is a deficient number, since it is larger than the sum of its proper divisors (1).

66255121 is an equidigital number, since it uses as much as digits as its factorization.

66255121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 28.

The square root of 66255121 is about 8139.7248725003. The cubic root of 66255121 is about 404.6440422647.

The spelling of 66255121 in words is "sixty-six million, two hundred fifty-five thousand, one hundred twenty-one".