1243243455020 has 96 divisors (see below), whose sum is σ = 3068617147008. Its totient is φ = 414167427072.

The previous prime is 1243243455019. The next prime is 1243243455061. The reversal of 1243243455020 is 205543423421.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3633224 + ... + 3960656.

It is an arithmetic number, because the mean of its divisors is an integer number (31964761948).

Almost surely, 2^{1243243455020} is an apocalyptic number.

1243243455020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1243243455020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1534308573504).

1243243455020 is an abundant number, since it is smaller than the sum of its proper divisors (1825373691988).

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

1243243455020 is a wasteful number, since it uses less digits than its factorization.

1243243455020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328219 (or 328217 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 35.

Adding to 1243243455020 its reverse (205543423421), we get a palindrome (1448786878441).

The spelling of 1243243455020 in words is "one trillion, two hundred forty-three billion, two hundred forty-three million, four hundred fifty-five thousand, twenty".