401665366 has 16 divisors (see below), whose sum is σ = 610182720. Its totient is φ = 198278080.

The previous prime is 401665361. The next prime is 401665387. The reversal of 401665366 is 663566104.

It is a super-2 number, since 2×401665366² = 322670132487827912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401665361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160920 + ... + 163396.

It is an arithmetic number, because the mean of its divisors is an integer number (38136420).

Almost surely, 2^401665366 is an apocalyptic number.

401665366 is a deficient number, since it is larger than the sum of its proper divisors (208517354).

401665366 is a wasteful number, since it uses less digits than its factorization.

401665366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3479.

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

The square root of 401665366 is about 20041.5909049157. The cubic root of 401665366 is about 737.8274273772.

The spelling of 401665366 in words is "four hundred one million, six hundred sixty-five thousand, three hundred sixty-six".