66412069 has 2 divisors, whose sum is σ = 66412070. Its totient is φ = 66412068.

The previous prime is 66412057. The next prime is 66412079. The reversal of 66412069 is 96021466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61811044 + 4601025 = 7862^2 + 2145^2 .

It is a cyclic number.

It is not a de Polignac number, because 66412069 - 2¹⁵ = 66379301 is a prime.

It is a super-2 number, since 2×66412069² = 8821125817721522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66412009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33206034 + 33206035.

It is an arithmetic number, because the mean of its divisors is an integer number (33206035).

Almost surely, 2^66412069 is an apocalyptic number.

It is an amenable number.

66412069 is a deficient number, since it is larger than the sum of its proper divisors (1).

66412069 is an equidigital number, since it uses as much as digits as its factorization.

66412069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 66412069 is about 8149.3600362237. The cubic root of 66412069 is about 404.9633030815.

The spelling of 66412069 in words is "sixty-six million, four hundred twelve thousand, sixty-nine".