3666064781 has 2 divisors, whose sum is σ = 3666064782. Its totient is φ = 3666064780.

The previous prime is 3666064729. The next prime is 3666064793. The reversal of 3666064781 is 1874606663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3210242281 + 455822500 = 56659^2 + 21350^2 .

It is an emirp because it is prime and its reverse (1874606663) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3666064781 - 2²⁶ = 3598955917 is a prime.

It is a super-2 number, since 2×3666064781² = 26880061956977155922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3666064711) 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, 1833032390 + 1833032391.

It is an arithmetic number, because the mean of its divisors is an integer number (1833032391).

Almost surely, 2^3666064781 is an apocalyptic number.

It is an amenable number.

3666064781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3666064781 is an equidigital number, since it uses as much as digits as its factorization.

3666064781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 47.

The square root of 3666064781 is about 60548.0369706566. The cubic root of 3666064781 is about 1541.9372904977.

The spelling of 3666064781 in words is "three billion, six hundred sixty-six million, sixty-four thousand, seven hundred eighty-one".