66774749 has 2 divisors, whose sum is σ = 66774750. Its totient is φ = 66774748.

The previous prime is 66774737. The next prime is 66774787. The reversal of 66774749 is 94747766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38875225 + 27899524 = 6235^2 + 5282^2 .

It is a cyclic number.

It is not a de Polignac number, because 66774749 - 2¹⁶ = 66709213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66774697 and 66774706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66779749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33387374 + 33387375.

It is an arithmetic number, because the mean of its divisors is an integer number (33387375).

Almost surely, 2^66774749 is an apocalyptic number.

It is an amenable number.

66774749 is a deficient number, since it is larger than the sum of its proper divisors (1).

66774749 is an equidigital number, since it uses as much as digits as its factorization.

66774749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1778112, while the sum is 50.

The square root of 66774749 is about 8171.5817930190. The cubic root of 66774749 is about 405.6991409209.

The spelling of 66774749 in words is "sixty-six million, seven hundred seventy-four thousand, seven hundred forty-nine".