243247656959 has 4 divisors (see below), whose sum is σ = 256050165240. Its totient is φ = 230445148680.

The previous prime is 243247656901. The next prime is 243247656973. The reversal of 243247656959 is 959656742342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 959656742342 = 2 ⋅479828371171.

It is a cyclic number.

It is not a de Polignac number, because 243247656959 - 2¹² = 243247652863 is a prime.

It is a super-2 number, since 2×243247656959² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243247656559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6401254112 + ... + 6401254149.

It is an arithmetic number, because the mean of its divisors is an integer number (64012541310).

Almost surely, 2^243247656959 is an apocalyptic number.

243247656959 is a deficient number, since it is larger than the sum of its proper divisors (12802508281).

243247656959 is a wasteful number, since it uses less digits than its factorization.

243247656959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12802508280.

The product of its digits is 97977600, while the sum is 62.

The spelling of 243247656959 in words is "two hundred forty-three billion, two hundred forty-seven million, six hundred fifty-six thousand, nine hundred fifty-nine".