243243241553 has 32 divisors (see below), whose sum is σ = 281108889600. Its totient is φ = 208718959680.

The previous prime is 243243241543. The next prime is 243243241621. The reversal of 243243241553 is 355142342342.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243243241553 is a prime.

It is a super-2 number, since 2×243243241553² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243243241543) 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, 2511008 + ... + 2606078.

It is an arithmetic number, because the mean of its divisors is an integer number (8784652800).

Almost surely, 2^243243241553 is an apocalyptic number.

243243241553 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

243243241553 is a deficient number, since it is larger than the sum of its proper divisors (37865648047).

243243241553 is a wasteful number, since it uses less digits than its factorization.

243243241553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95349.

The product of its digits is 345600, while the sum is 38.

Adding to 243243241553 its reverse (355142342342), we get a palindrome (598385583895).

The spelling of 243243241553 in words is "two hundred forty-three billion, two hundred forty-three million, two hundred forty-one thousand, five hundred fifty-three".