66953729 has 2 divisors, whose sum is σ = 66953730. Its totient is φ = 66953728.

The previous prime is 66953651. The next prime is 66953737. The reversal of 66953729 is 92735966.

66953729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63170704 + 3783025 = 7948^2 + 1945^2 .

It is a cyclic number.

It is not a de Polignac number, because 66953729 - 2¹² = 66949633 is a prime.

It is not a weakly prime, because it can be changed into another prime (66953329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33476864 + 33476865.

It is an arithmetic number, because the mean of its divisors is an integer number (33476865).

Almost surely, 2^66953729 is an apocalyptic number.

It is an amenable number.

66953729 is a deficient number, since it is larger than the sum of its proper divisors (1).

66953729 is an equidigital number, since it uses as much as digits as its factorization.

66953729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 612360, while the sum is 47.

The square root of 66953729 is about 8182.5258325287. The cubic root of 66953729 is about 406.0612900588.

The spelling of 66953729 in words is "sixty-six million, nine hundred fifty-three thousand, seven hundred twenty-nine".