3685784161 has 4 divisors (see below), whose sum is σ = 3902595012. Its totient is φ = 3468973312.

The previous prime is 3685784147. The next prime is 3685784177. The reversal of 3685784161 is 1614875863.

It is a happy number.

3685784161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1614875863 = 28817 ⋅56039.

It can be written as a sum of positive squares in 2 ways, for example, as 3126934561 + 558849600 = 55919^2 + 23640^2 .

It is a cyclic number.

It is not a de Polignac number, because 3685784161 - 2¹⁹ = 3685259873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3685784131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108405400 + ... + 108405433.

It is an arithmetic number, because the mean of its divisors is an integer number (975648753).

Almost surely, 2^3685784161 is an apocalyptic number.

It is an amenable number.

3685784161 is a deficient number, since it is larger than the sum of its proper divisors (216810851).

3685784161 is a wasteful number, since it uses less digits than its factorization.

3685784161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216810850.

The product of its digits is 967680, while the sum is 49.

The square root of 3685784161 is about 60710.6593688456. The cubic root of 3685784161 is about 1544.6969882958.

The spelling of 3685784161 in words is "three billion, six hundred eighty-five million, seven hundred eighty-four thousand, one hundred sixty-one".