242556661533 has 32 divisors (see below), whose sum is σ = 327421543680. Its totient is φ = 159712716800.

The previous prime is 242556661517. The next prime is 242556661537. The reversal of 242556661533 is 335166655242.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 242556661533 - 2⁴ = 242556661517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242556661537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 128403853 + ... + 128405741.

It is an arithmetic number, because the mean of its divisors is an integer number (10231923240).

Almost surely, 2^242556661533 is an apocalyptic number.

It is an amenable number.

242556661533 is a deficient number, since it is larger than the sum of its proper divisors (84864882147).

242556661533 is a wasteful number, since it uses less digits than its factorization.

242556661533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3557.

The product of its digits is 3888000, while the sum is 48.

The spelling of 242556661533 in words is "two hundred forty-two billion, five hundred fifty-six million, six hundred sixty-one thousand, five hundred thirty-three".