3685691873 has 2 divisors, whose sum is σ = 3685691874. Its totient is φ = 3685691872.

The previous prime is 3685691861. The next prime is 3685691887. The reversal of 3685691873 is 3781965863.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3311772304 + 373919569 = 57548^2 + 19337^2 .

It is a cyclic number.

It is not a de Polignac number, because 3685691873 - 2⁸ = 3685691617 is a prime.

It is not a weakly prime, because it can be changed into another prime (3685691813) 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, 1842845936 + 1842845937.

It is an arithmetic number, because the mean of its divisors is an integer number (1842845937).

Almost surely, 2^3685691873 is an apocalyptic number.

It is an amenable number.

3685691873 is a deficient number, since it is larger than the sum of its proper divisors (1).

3685691873 is an equidigital number, since it uses as much as digits as its factorization.

3685691873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6531840, while the sum is 56.

The square root of 3685691873 is about 60709.8992998671. The cubic root of 3685691873 is about 1544.6840956811.

The spelling of 3685691873 in words is "three billion, six hundred eighty-five million, six hundred ninety-one thousand, eight hundred seventy-three".