243961663 has 8 divisors (see below), whose sum is σ = 266261760. Its totient is φ = 221681880.

The previous prime is 243961657. The next prime is 243961687. The reversal of 243961663 is 366169342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243961663 - 2²⁵ = 210407231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243961633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31578 + ... + 38536.

It is an arithmetic number, because the mean of its divisors is an integer number (33282720).

Almost surely, 2^243961663 is an apocalyptic number.

243961663 is a deficient number, since it is larger than the sum of its proper divisors (22300097).

243961663 is a wasteful number, since it uses less digits than its factorization.

243961663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10157.

The product of its digits is 139968, while the sum is 40.

The square root of 243961663 is about 15619.2721661414. The cubic root of 243961663 is about 624.8472484302.

The spelling of 243961663 in words is "two hundred forty-three million, nine hundred sixty-one thousand, six hundred sixty-three".