665867366 has 4 divisors (see below), whose sum is σ = 998801052. Its totient is φ = 332933682.

The previous prime is 665867359. The next prime is 665867381. The reversal of 665867366 is 663768566.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166466840 + ... + 166466843.

It is an arithmetic number, because the mean of its divisors is an integer number (249700263).

Almost surely, 2^665867366 is an apocalyptic number.

665867366 is a deficient number, since it is larger than the sum of its proper divisors (332933686).

665867366 is a wasteful number, since it uses less digits than its factorization.

665867366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332933685.

The product of its digits is 6531840, while the sum is 53.

The square root of 665867366 is about 25804.4059416217. The cubic root of 665867366 is about 873.2311983907.

The spelling of 665867366 in words is "six hundred sixty-five million, eight hundred sixty-seven thousand, three hundred sixty-six".