66069541 has 2 divisors, whose sum is σ = 66069542. Its totient is φ = 66069540.

The previous prime is 66069499. The next prime is 66069581. The reversal of 66069541 is 14596066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47320641 + 18748900 = 6879^2 + 4330^2 .

It is a cyclic number.

It is not a de Polignac number, because 66069541 - 2¹¹ = 66067493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66069541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66069581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33034770 + 33034771.

It is an arithmetic number, because the mean of its divisors is an integer number (33034771).

Almost surely, 2^66069541 is an apocalyptic number.

It is an amenable number.

66069541 is a deficient number, since it is larger than the sum of its proper divisors (1).

66069541 is an equidigital number, since it uses as much as digits as its factorization.

66069541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 66069541 is about 8128.3172305219. The cubic root of 66069541 is about 404.2658875303.

The spelling of 66069541 in words is "sixty-six million, sixty-nine thousand, five hundred forty-one".