3681658609 has 4 divisors (see below), whose sum is σ = 3699107440. Its totient is φ = 3664209780.

The previous prime is 3681658597. The next prime is 3681658613. The reversal of 3681658609 is 9068561863.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9068561863 = 13807 ⋅656809.

It is a cyclic number.

It is not a de Polignac number, because 3681658609 - 2¹⁷ = 3681527537 is a prime.

It is a super-2 number, since 2×3681658609² = 27109220226447629762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3681658649) 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 in 3 ways as a sum of consecutive naturals, for example, 8724099 + ... + 8724520.

It is an arithmetic number, because the mean of its divisors is an integer number (924776860).

Almost surely, 2^3681658609 is an apocalyptic number.

It is an amenable number.

3681658609 is a deficient number, since it is larger than the sum of its proper divisors (17448831).

3681658609 is a wasteful number, since it uses less digits than its factorization.

3681658609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17448830.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The square root of 3681658609 is about 60676.6726922299. The cubic root of 3681658609 is about 1544.1204391684.

The spelling of 3681658609 in words is "three billion, six hundred eighty-one million, six hundred fifty-eight thousand, six hundred nine".