3685780673173 has 2 divisors, whose sum is σ = 3685780673174. Its totient is φ = 3685780673172.

The previous prime is 3685780673171. The next prime is 3685780673287. The reversal of 3685780673173 is 3713760875863.

3685780673173 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3636408721969 + 49371951204 = 1906937^2 + 222198^2 .

It is a cyclic number.

It is not a de Polignac number, because 3685780673173 - 2¹ = 3685780673171 is a prime.

It is a super-2 number, since 2×3685780673173² (a number of 26 digits) contains 22 as substring.

Together with 3685780673171, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3685780673171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1842890336586 + 1842890336587.

It is an arithmetic number, because the mean of its divisors is an integer number (1842890336587).

Almost surely, 2^{3685780673173} is an apocalyptic number.

It is an amenable number.

3685780673173 is a deficient number, since it is larger than the sum of its proper divisors (1).

3685780673173 is an equidigital number, since it uses as much as digits as its factorization.

3685780673173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 106686720, while the sum is 64.

The spelling of 3685780673173 in words is "three trillion, six hundred eighty-five billion, seven hundred eighty million, six hundred seventy-three thousand, one hundred seventy-three".