66827779 has 2 divisors, whose sum is σ = 66827780. Its totient is φ = 66827778.

The previous prime is 66827771. The next prime is 66827797. The reversal of 66827779 is 97772866.

It is a happy number.

Together with next prime (66827797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66827779 - 2³ = 66827771 is a prime.

It is not a weakly prime, because it can be changed into another prime (66827771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33413889 + 33413890.

It is an arithmetic number, because the mean of its divisors is an integer number (33413890).

Almost surely, 2^66827779 is an apocalyptic number.

66827779 is a deficient number, since it is larger than the sum of its proper divisors (1).

66827779 is an equidigital number, since it uses as much as digits as its factorization.

66827779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1778112, while the sum is 52.

The square root of 66827779 is about 8174.8259308685. The cubic root of 66827779 is about 405.8065095146.

The spelling of 66827779 in words is "sixty-six million, eight hundred twenty-seven thousand, seven hundred seventy-nine".