66770069 has 2 divisors, whose sum is σ = 66770070. Its totient is φ = 66770068.

The previous prime is 66770057. The next prime is 66770071. The reversal of 66770069 is 96007766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64480900 + 2289169 = 8030^2 + 1513^2 .

It is a cyclic number.

It is not a de Polignac number, because 66770069 - 2²⁰ = 65721493 is a prime.

It is a super-2 number, since 2×66770069² = 8916484228529522, which contains 22 as substring.

Together with 66770071, 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 (66770369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33385034 + 33385035.

It is an arithmetic number, because the mean of its divisors is an integer number (33385035).

Almost surely, 2^66770069 is an apocalyptic number.

It is an amenable number.

66770069 is a deficient number, since it is larger than the sum of its proper divisors (1).

66770069 is an equidigital number, since it uses as much as digits as its factorization.

66770069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 66770069 is about 8171.2954297345. The cubic root of 66770069 is about 405.6896627056.

The spelling of 66770069 in words is "sixty-six million, seven hundred seventy thousand, sixty-nine".