66144601 has 2 divisors, whose sum is σ = 66144602. Its totient is φ = 66144600.

The previous prime is 66144587. The next prime is 66144613. The reversal of 66144601 is 10644166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65626201 + 518400 = 8101^2 + 720^2 .

It is a cyclic number.

It is not a de Polignac number, because 66144601 - 2⁷ = 66144473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66144601.

It is not a weakly prime, because it can be changed into another prime (66144691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33072300 + 33072301.

It is an arithmetic number, because the mean of its divisors is an integer number (33072301).

Almost surely, 2^66144601 is an apocalyptic number.

It is an amenable number.

66144601 is a deficient number, since it is larger than the sum of its proper divisors (1).

66144601 is an equidigital number, since it uses as much as digits as its factorization.

66144601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 66144601 is about 8132.9331117377. The cubic root of 66144601 is about 404.4189218090.

Adding to 66144601 its reverse (10644166), we get a palindrome (76788767).

The spelling of 66144601 in words is "sixty-six million, one hundred forty-four thousand, six hundred one".