66754213 has 2 divisors, whose sum is σ = 66754214. Its totient is φ = 66754212.

The previous prime is 66754199. The next prime is 66754217. The reversal of 66754213 is 31245766.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49589764 + 17164449 = 7042^2 + 4143^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66754213 is a prime.

It is a super-2 number, since 2×66754213² = 8912249906498738, which contains 22 as substring.

It is a zygodrome in base 4.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66754217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33377106 + 33377107.

It is an arithmetic number, because the mean of its divisors is an integer number (33377107).

Almost surely, 2^66754213 is an apocalyptic number.

It is an amenable number.

66754213 is a deficient number, since it is larger than the sum of its proper divisors (1).

66754213 is an equidigital number, since it uses as much as digits as its factorization.

66754213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 34.

The square root of 66754213 is about 8170.3251465287. The cubic root of 66754213 is about 405.6575468956.

Adding to 66754213 its reverse (31245766), we get a palindrome (97999979).

The spelling of 66754213 in words is "sixty-six million, seven hundred fifty-four thousand, two hundred thirteen".