243926853661 has 16 divisors (see below), whose sum is σ = 251563003648. Its totient is φ = 236387289600.

The previous prime is 243926853641. The next prime is 243926853691. The reversal of 243926853661 is 166358629342.

It is a cyclic number.

It is not a de Polignac number, because 243926853661 - 2¹¹ = 243926851613 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 (243926853601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2764945 + ... + 2851801.

It is an arithmetic number, because the mean of its divisors is an integer number (15722687728).

Almost surely, 2^243926853661 is an apocalyptic number.

It is an amenable number.

243926853661 is a deficient number, since it is larger than the sum of its proper divisors (7636149987).

243926853661 is a wasteful number, since it uses less digits than its factorization.

243926853661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87412.

The product of its digits is 11197440, while the sum is 55.

The spelling of 243926853661 in words is "two hundred forty-three billion, nine hundred twenty-six million, eight hundred fifty-three thousand, six hundred sixty-one".