3651666 has 8 divisors (see below), whose sum is σ = 7303344. Its totient is φ = 1217220.

The previous prime is 3651653. The next prime is 3651671. The reversal of 3651666 is 6661563.

It is a sphenic number, since it is the product of 3 distinct primes.

3651666 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304300 + ... + 304311.

It is an arithmetic number, because the mean of its divisors is an integer number (912918).

Almost surely, 2^3651666 is an apocalyptic number.

3651666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3651666 is a wasteful number, since it uses less digits than its factorization.

3651666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608616.

The product of its digits is 19440, while the sum is 33.

The square root of 3651666 is about 1910.9332798400. The cubic root of 3651666 is about 153.9915945263.

The spelling of 3651666 in words is "three million, six hundred fifty-one thousand, six hundred sixty-six".