1605055666 has 8 divisors (see below), whose sum is σ = 2534298480. Its totient is φ = 760289508.

The previous prime is 1605055649. The next prime is 1605055679. The reversal of 1605055666 is 6665505061.

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

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, 21119116 + ... + 21119191.

It is an arithmetic number, because the mean of its divisors is an integer number (316787310).

Almost surely, 2^1605055666 is an apocalyptic number.

1605055666 is a deficient number, since it is larger than the sum of its proper divisors (929242814).

1605055666 is a wasteful number, since it uses less digits than its factorization.

1605055666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42238328.

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 1605055666 is about 40063.1459823115. The cubic root of 1605055666 is about 1170.8377047927.

The spelling of 1605055666 in words is "one billion, six hundred five million, fifty-five thousand, six hundred sixty-six".