66735541 has 2 divisors, whose sum is σ = 66735542. Its totient is φ = 66735540.

The previous prime is 66735521. The next prime is 66735547. The reversal of 66735541 is 14553766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66357316 + 378225 = 8146^2 + 615^2 .

It is a cyclic number.

It is not a de Polignac number, because 66735541 - 2⁵ = 66735509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66735541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66735547) 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, 33367770 + 33367771.

It is an arithmetic number, because the mean of its divisors is an integer number (33367771).

Almost surely, 2^66735541 is an apocalyptic number.

It is an amenable number.

66735541 is a deficient number, since it is larger than the sum of its proper divisors (1).

66735541 is an equidigital number, since it uses as much as digits as its factorization.

66735541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 37.

The square root of 66735541 is about 8169.1823948300. The cubic root of 66735541 is about 405.6197208484.

It can be divided in two parts, 66735 and 541, that added together give a palindrome (67276).

The spelling of 66735541 in words is "sixty-six million, seven hundred thirty-five thousand, five hundred forty-one".