666765366 has 16 divisors (see below), whose sum is σ = 1403716800. Its totient is φ = 210557448.

The previous prime is 666765343. The next prime is 666765373. The reversal of 666765366 is 663567666.

666765366 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×666765366² = 889152106594227912, which contains 22 as substring.

It is a congruent number.

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, 2924296 + ... + 2924523.

It is an arithmetic number, because the mean of its divisors is an integer number (87732300).

Almost surely, 2^666765366 is an apocalyptic number.

666765366 is an abundant number, since it is smaller than the sum of its proper divisors (736951434).

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

666765366 is a wasteful number, since it uses less digits than its factorization.

666765366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5848843.

The product of its digits is 4898880, while the sum is 51.

The square root of 666765366 is about 25821.8002083511. The cubic root of 666765366 is about 873.6235735137.

The spelling of 666765366 in words is "six hundred sixty-six million, seven hundred sixty-five thousand, three hundred sixty-six".