66774241 has 2 divisors, whose sum is σ = 66774242. Its totient is φ = 66774240.

The previous prime is 66774203. The next prime is 66774259. The reversal of 66774241 is 14247766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65610000 + 1164241 = 8100^2 + 1079^2 .

It is a cyclic number.

It is not a de Polignac number, because 66774241 - 2¹⁷ = 66643169 is a prime.

It is a super-2 number, since 2×66774241² = 8917598522252162, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66774241.

It is not a weakly prime, because it can be changed into another prime (66774271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33387120 + 33387121.

It is an arithmetic number, because the mean of its divisors is an integer number (33387121).

Almost surely, 2^66774241 is an apocalyptic number.

It is an amenable number.

66774241 is a deficient number, since it is larger than the sum of its proper divisors (1).

66774241 is an equidigital number, since it uses as much as digits as its factorization.

66774241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 37.

The square root of 66774241 is about 8171.5507096267. The cubic root of 66774241 is about 405.6981121104.

The spelling of 66774241 in words is "sixty-six million, seven hundred seventy-four thousand, two hundred forty-one".