66053261 has 2 divisors, whose sum is σ = 66053262. Its totient is φ = 66053260.

The previous prime is 66053249. The next prime is 66053287. The reversal of 66053261 is 16235066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66015625 + 37636 = 8125^2 + 194^2 .

It is a cyclic number.

It is not a de Polignac number, because 66053261 - 2²² = 61858957 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66053201) 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, 33026630 + 33026631.

It is an arithmetic number, because the mean of its divisors is an integer number (33026631).

Almost surely, 2^66053261 is an apocalyptic number.

It is an amenable number.

66053261 is a deficient number, since it is larger than the sum of its proper divisors (1).

66053261 is an equidigital number, since it uses as much as digits as its factorization.

66053261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 66053261 is about 8127.3157315315. The cubic root of 66053261 is about 404.2326801491.

The spelling of 66053261 in words is "sixty-six million, fifty-three thousand, two hundred sixty-one".