66704149 has 2 divisors, whose sum is σ = 66704150. Its totient is φ = 66704148.

The previous prime is 66704101. The next prime is 66704153. The reversal of 66704149 is 94140766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64112049 + 2592100 = 8007^2 + 1610^2 .

It is a cyclic number.

It is not a de Polignac number, because 66704149 - 2²⁵ = 33149717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66704159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33352074 + 33352075.

It is an arithmetic number, because the mean of its divisors is an integer number (33352075).

Almost surely, 2^66704149 is an apocalyptic number.

It is an amenable number.

66704149 is a deficient number, since it is larger than the sum of its proper divisors (1).

66704149 is an equidigital number, since it uses as much as digits as its factorization.

66704149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 66704149 is about 8167.2608015172. The cubic root of 66704149 is about 405.5561105085.

The spelling of 66704149 in words is "sixty-six million, seven hundred four thousand, one hundred forty-nine".