66777427 has 2 divisors, whose sum is σ = 66777428. Its totient is φ = 66777426.

The previous prime is 66777413. The next prime is 66777461. The reversal of 66777427 is 72477766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66777427 - 2⁷ = 66777299 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66777497) 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, 33388713 + 33388714.

It is an arithmetic number, because the mean of its divisors is an integer number (33388714).

Almost surely, 2^66777427 is an apocalyptic number.

66777427 is a deficient number, since it is larger than the sum of its proper divisors (1).

66777427 is an equidigital number, since it uses as much as digits as its factorization.

66777427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 691488, while the sum is 46.

The square root of 66777427 is about 8171.7456519400. The cubic root of 66777427 is about 405.7045643671.

The spelling of 66777427 in words is "sixty-six million, seven hundred seventy-seven thousand, four hundred twenty-seven".