243669666 has 16 divisors (see below), whose sum is σ = 487620000. Its totient is φ = 81176448.

The previous prime is 243669649. The next prime is 243669719. The reversal of 243669666 is 666966342.

It is a super-2 number, since 2×243669666² = 118749812257103112, 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, 585 + ... + 22083.

It is an arithmetic number, because the mean of its divisors is an integer number (30476250).

Almost surely, 2^243669666 is an apocalyptic number.

243669666 is an abundant number, since it is smaller than the sum of its proper divisors (243950334).

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

243669666 is a wasteful number, since it uses less digits than its factorization.

243669666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23393.

The product of its digits is 1679616, while the sum is 48.

The square root of 243669666 is about 15609.9220369610. The cubic root of 243669666 is about 624.5978562909.

The spelling of 243669666 in words is "two hundred forty-three million, six hundred sixty-nine thousand, six hundred sixty-six".