1243243455018 has 64 divisors (see below), whose sum is σ = 2572750252800. Its totient is φ = 400243299840.

The previous prime is 1243243455017. The next prime is 1243243455019. The reversal of 1243243455018 is 8105543423421.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1243243455017) and next prime (1243243455019).

It is not an unprimeable number, because it can be changed into a prime (1243243455017) 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, 93972028 + ... + 93985256.

It is an arithmetic number, because the mean of its divisors is an integer number (40199222700).

Almost surely, 2^{1243243455018} is an apocalyptic number.

1243243455018 is an abundant number, since it is smaller than the sum of its proper divisors (1329506797782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1243243455018 is a wasteful number, since it uses less digits than its factorization.

1243243455018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17087.

The product of its (nonzero) digits is 460800, while the sum is 42.

Adding to 1243243455018 its reverse (8105543423421), we get a palindrome (9348786878439).

The spelling of 1243243455018 in words is "one trillion, two hundred forty-three billion, two hundred forty-three million, four hundred fifty-five thousand, eighteen".