401663566 has 8 divisors (see below), whose sum is σ = 602632944. Its totient is φ = 200785920.

The previous prime is 401663533. The next prime is 401663569. The reversal of 401663566 is 665366104.

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

It is a super-2 number, since 2×401663566² = 322667240503672712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401663569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10675 + ... + 30286.

It is an arithmetic number, because the mean of its divisors is an integer number (75329118).

Almost surely, 2^401663566 is an apocalyptic number.

401663566 is a deficient number, since it is larger than the sum of its proper divisors (200969378).

401663566 is a wasteful number, since it uses less digits than its factorization.

401663566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45866.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 401663566 is about 20041.5459982507. The cubic root of 401663566 is about 737.8263252232.

The spelling of 401663566 in words is "four hundred one million, six hundred sixty-three thousand, five hundred sixty-six".