66511069 has 2 divisors, whose sum is σ = 66511070. Its totient is φ = 66511068.

The previous prime is 66511033. The next prime is 66511079. The reversal of 66511069 is 96011566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42745444 + 23765625 = 6538^2 + 4875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66511069 is a prime.

It is a super-2 number, since 2×66511069² = 8847444599045522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66511019) 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, 33255534 + 33255535.

It is an arithmetic number, because the mean of its divisors is an integer number (33255535).

Almost surely, 2^66511069 is an apocalyptic number.

It is an amenable number.

66511069 is a deficient number, since it is larger than the sum of its proper divisors (1).

66511069 is an equidigital number, since it uses as much as digits as its factorization.

66511069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 66511069 is about 8155.4318708453. The cubic root of 66511069 is about 405.1644284833.

The spelling of 66511069 in words is "sixty-six million, five hundred eleven thousand, sixty-nine".