243080661 has 16 divisors (see below), whose sum is σ = 341749440. Its totient is φ = 153262080.

The previous prime is 243080657. The next prime is 243080683. The reversal of 243080661 is 166080342.

It is not a de Polignac number, because 243080661 - 2² = 243080657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243080611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33211 + ... + 39863.

It is an arithmetic number, because the mean of its divisors is an integer number (21359340).

Almost surely, 2^243080661 is an apocalyptic number.

It is an amenable number.

243080661 is a deficient number, since it is larger than the sum of its proper divisors (98668779).

243080661 is a wasteful number, since it uses less digits than its factorization.

243080661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7316.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 243080661 is about 15591.0442562389. The cubic root of 243080661 is about 624.0941852202.

The spelling of 243080661 in words is "two hundred forty-three million, eighty thousand, six hundred sixty-one".