66524069 has 2 divisors, whose sum is σ = 66524070. Its totient is φ = 66524068.

The previous prime is 66524021. The next prime is 66524071. The reversal of 66524069 is 96042566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66227044 + 297025 = 8138^2 + 545^2 .

It is a cyclic number.

It is not a de Polignac number, because 66524069 - 2²⁰ = 65475493 is a prime.

It is a super-2 number, since 2×66524069² = 8850903512633522, which contains 22 as substring.

Together with 66524071, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66524369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33262034 + 33262035.

It is an arithmetic number, because the mean of its divisors is an integer number (33262035).

Almost surely, 2^66524069 is an apocalyptic number.

It is an amenable number.

66524069 is a deficient number, since it is larger than the sum of its proper divisors (1).

66524069 is an equidigital number, since it uses as much as digits as its factorization.

66524069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 66524069 is about 8156.2288467159. The cubic root of 66524069 is about 405.1908240619.

The spelling of 66524069 in words is "sixty-six million, five hundred twenty-four thousand, sixty-nine".