866505668 has 24 divisors (see below), whose sum is σ = 1734214272. Its totient is φ = 371101824.

The previous prime is 866505643. The next prime is 866505709.

866505668 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×866505668² = 1501664145352252448, which contains 22 as substring.

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, 33521 + ... + 53447.

It is an arithmetic number, because the mean of its divisors is an integer number (72258928).

Almost surely, 2^866505668 is an apocalyptic number.

It is an amenable number.

866505668 is an abundant number, since it is smaller than the sum of its proper divisors (867708604).

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

866505668 is a wasteful number, since it uses less digits than its factorization.

866505668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21491 (or 21489 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 50.

The square root of 866505668 is about 29436.4683343638. The cubic root of 866505668 is about 953.3604601580.

The spelling of 866505668 in words is "eight hundred sixty-six million, five hundred five thousand, six hundred sixty-eight".