401165666 has 16 divisors (see below), whose sum is σ = 657030528. Its totient is φ = 182187600.

The previous prime is 401165651. The next prime is 401165683. The reversal of 401165666 is 666561104.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19676 + ... + 34488.

It is an arithmetic number, because the mean of its divisors is an integer number (41064408).

Almost surely, 2^401165666 is an apocalyptic number.

401165666 is a deficient number, since it is larger than the sum of its proper divisors (255864862).

401165666 is a wasteful number, since it uses less digits than its factorization.

401165666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16057.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 401165666 is about 20029.1204499848. The cubic root of 401165666 is about 737.5213306480.

The spelling of 401165666 in words is "four hundred one million, one hundred sixty-five thousand, six hundred sixty-six".