66379777 has 2 divisors, whose sum is σ = 66379778. Its totient is φ = 66379776.

The previous prime is 66379723. The next prime is 66379799. The reversal of 66379777 is 77797366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58308496 + 8071281 = 7636^2 + 2841^2 .

It is a cyclic number.

It is not a de Polignac number, because 66379777 - 2¹⁵ = 66347009 is a prime.

It is not a weakly prime, because it can be changed into another prime (66379717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33189888 + 33189889.

It is an arithmetic number, because the mean of its divisors is an integer number (33189889).

It is a Proth number, since it is equal to 8103 ⋅ 2¹³ + 1 and 8103 < 2¹³.

Almost surely, 2^66379777 is an apocalyptic number.

It is an amenable number.

66379777 is a deficient number, since it is larger than the sum of its proper divisors (1).

66379777 is an equidigital number, since it uses as much as digits as its factorization.

66379777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2333772, while the sum is 52.

The square root of 66379777 is about 8147.3785354554. The cubic root of 66379777 is about 404.8976564038.

The spelling of 66379777 in words is "sixty-six million, three hundred seventy-nine thousand, seven hundred seventy-seven".