243120138368 has 16 divisors (see below), whose sum is σ = 484340900910. Its totient is φ = 121560069120.

The previous prime is 243120138367. The next prime is 243120138409. The reversal of 243120138368 is 863831021342.

243120138368 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 225503416384 + 17616721984 = 474872^2 + 132728^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (243120138367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 949687913 + ... + 949688168.

Almost surely, 2^243120138368 is an apocalyptic number.

It is an amenable number.

243120138368 is a deficient number, since it is larger than the sum of its proper divisors (241220762542).

243120138368 is an equidigital number, since it uses as much as digits as its factorization.

243120138368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1899376095 (or 1899376083 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 41.

The spelling of 243120138368 in words is "two hundred forty-three billion, one hundred twenty million, one hundred thirty-eight thousand, three hundred sixty-eight".