66827801 has 2 divisors, whose sum is σ = 66827802. Its totient is φ = 66827800.

The previous prime is 66827797. The next prime is 66827819. The reversal of 66827801 is 10872866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46936201 + 19891600 = 6851^2 + 4460^2 .

It is a cyclic number.

It is not a de Polignac number, because 66827801 - 2² = 66827797 is a prime.

It is a super-3 number, since 3×66827801³ (a number of 24 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (66827821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33413900 + 33413901.

It is an arithmetic number, because the mean of its divisors is an integer number (33413901).

Almost surely, 2^66827801 is an apocalyptic number.

It is an amenable number.

66827801 is a deficient number, since it is larger than the sum of its proper divisors (1).

66827801 is an equidigital number, since it uses as much as digits as its factorization.

66827801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 66827801 is about 8174.8272764628. The cubic root of 66827801 is about 405.8065540457.

The spelling of 66827801 in words is "sixty-six million, eight hundred twenty-seven thousand, eight hundred one".