242689663 has 4 divisors (see below), whose sum is σ = 242722480. Its totient is φ = 242656848.

The previous prime is 242689639. The next prime is 242689693. The reversal of 242689663 is 366986242.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 242689663 - 2⁵ = 242689631 is a prime.

It is the 15579-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242689613) by changing a digit.

It is a nontrivial repunit in base 15578.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 478 + ... + 22036.

It is an arithmetic number, because the mean of its divisors is an integer number (60680620).

Almost surely, 2^242689663 is an apocalyptic number.

242689663 is a deficient number, since it is larger than the sum of its proper divisors (32817).

242689663 is a wasteful number, since it uses less digits than its factorization.

242689663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32816.

The product of its digits is 746496, while the sum is 46.

The square root of 242689663 is about 15578.5000240716. The cubic root of 242689663 is about 623.7593847876.

The spelling of 242689663 in words is "two hundred forty-two million, six hundred eighty-nine thousand, six hundred sixty-three".