66611047 has 2 divisors, whose sum is σ = 66611048. Its totient is φ = 66611046.

The previous prime is 66611003. The next prime is 66611053. The reversal of 66611047 is 74011666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66611047 - 2⁷ = 66610919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66611087) 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, 33305523 + 33305524.

It is an arithmetic number, because the mean of its divisors is an integer number (33305524).

Almost surely, 2^66611047 is an apocalyptic number.

66611047 is a deficient number, since it is larger than the sum of its proper divisors (1).

66611047 is an equidigital number, since it uses as much as digits as its factorization.

66611047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 66611047 is about 8161.5591035047. The cubic root of 66611047 is about 405.3673383152.

The spelling of 66611047 in words is "sixty-six million, six hundred eleven thousand, forty-seven".