243956614661 has 4 divisors (see below), whose sum is σ = 245031313632. Its totient is φ = 242881915692.

The previous prime is 243956614651. The next prime is 243956614667. The reversal of 243956614661 is 166416659342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243956614661 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 (243956614667) 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 3 ways as a sum of consecutive naturals, for example, 537349145 + ... + 537349598.

It is an arithmetic number, because the mean of its divisors is an integer number (61257828408).

Almost surely, 2^243956614661 is an apocalyptic number.

It is an amenable number.

243956614661 is a deficient number, since it is larger than the sum of its proper divisors (1074698971).

243956614661 is a wasteful number, since it uses less digits than its factorization.

243956614661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074698970.

The product of its digits is 5598720, while the sum is 53.

The spelling of 243956614661 in words is "two hundred forty-three billion, nine hundred fifty-six million, six hundred fourteen thousand, six hundred sixty-one".