66826849 has 2 divisors, whose sum is σ = 66826850. Its totient is φ = 66826848.

The previous prime is 66826841. The next prime is 66826871. The reversal of 66826849 is 94862866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66308449 + 518400 = 8143^2 + 720^2 .

It is a cyclic number.

It is not a de Polignac number, because 66826849 - 2³ = 66826841 is a prime.

It is not a weakly prime, because it can be changed into another prime (66826841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33413424 + 33413425.

It is an arithmetic number, because the mean of its divisors is an integer number (33413425).

Almost surely, 2^66826849 is an apocalyptic number.

It is an amenable number.

66826849 is a deficient number, since it is larger than the sum of its proper divisors (1).

66826849 is an equidigital number, since it uses as much as digits as its factorization.

66826849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 49.

The square root of 66826849 is about 8174.7690487255. The cubic root of 66826849 is about 405.8046270549.

It can be divided in two parts, 6682 and 6849, that added together give a palindrome (13531).

The spelling of 66826849 in words is "sixty-six million, eight hundred twenty-six thousand, eight hundred forty-nine".