3685780166813 has 2 divisors, whose sum is σ = 3685780166814. Its totient is φ = 3685780166812.

The previous prime is 3685780166797. The next prime is 3685780166821. The reversal of 3685780166813 is 3186610875863.

3685780166813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3248220407524 + 437559759289 = 1802282^2 + 661483^2 .

It is a cyclic number.

It is not a de Polignac number, because 3685780166813 - 2⁴ = 3685780166797 is a prime.

It is a super-2 number, since 2×3685780166813² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3685780166843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1842890083406 + 1842890083407.

It is an arithmetic number, because the mean of its divisors is an integer number (1842890083407).

Almost surely, 2^{3685780166813} is an apocalyptic number.

It is an amenable number.

3685780166813 is a deficient number, since it is larger than the sum of its proper divisors (1).

3685780166813 is an equidigital number, since it uses as much as digits as its factorization.

3685780166813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34836480, while the sum is 62.

The spelling of 3685780166813 in words is "three trillion, six hundred eighty-five billion, seven hundred eighty million, one hundred sixty-six thousand, eight hundred thirteen".