66444461 has 2 divisors, whose sum is σ = 66444462. Its totient is φ = 66444460.

The previous prime is 66444437. The next prime is 66444467. The reversal of 66444461 is 16444466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39300361 + 27144100 = 6269^2 + 5210^2 .

It is a cyclic number.

It is not a de Polignac number, because 66444461 - 2²² = 62250157 is a prime.

It is a Sophie Germain 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 (66444467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33222230 + 33222231.

It is an arithmetic number, because the mean of its divisors is an integer number (33222231).

Almost surely, 2^66444461 is an apocalyptic number.

It is an amenable number.

66444461 is a deficient number, since it is larger than the sum of its proper divisors (1).

66444461 is an equidigital number, since it uses as much as digits as its factorization.

66444461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 35.

The square root of 66444461 is about 8151.3471892688. The cubic root of 66444461 is about 405.0291316748.

The spelling of 66444461 in words is "sixty-six million, four hundred forty-four thousand, four hundred sixty-one".