242564756673847 has 4 divisors (see below), whose sum is σ = 242819284226400. Its totient is φ = 242310229121296.

The previous prime is 242564756673817. The next prime is 242564756673857. The reversal of 242564756673847 is 748376657465242.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 242564756673847 - 2¹⁵ = 242564756641079 is a prime.

It is a super-2 number, since 2×242564756673847² (a number of 30 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (76) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 (242564756673817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127263774847 + ... + 127263776752.

It is an arithmetic number, because the mean of its divisors is an integer number (60704821056600).

Almost surely, 2^{242564756673847} is an apocalyptic number.

242564756673847 is a deficient number, since it is larger than the sum of its proper divisors (254527552553).

242564756673847 is an equidigital number, since it uses as much as digits as its factorization.

242564756673847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254527552552.

The product of its digits is 11379916800, while the sum is 76.

The spelling of 242564756673847 in words is "two hundred forty-two trillion, five hundred sixty-four billion, seven hundred fifty-six million, six hundred seventy-three thousand, eight hundred forty-seven".