1215551342240 has 96 divisors (see below), whose sum is σ = 2925252320256. Its totient is φ = 477221713920.

The previous prime is 1215551342207. The next prime is 1215551342267. The reversal of 1215551342240 is 422431555121.

It is a self number, because there is not a number n which added to its sum of digits gives 1215551342240.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2293364 + ... + 2773196.

It is an arithmetic number, because the mean of its divisors is an integer number (30471378336).

Almost surely, 2^{1215551342240} is an apocalyptic number.

1215551342240 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 1215551342240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1462626160128).

1215551342240 is an abundant number, since it is smaller than the sum of its proper divisors (1709700978016).

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

1215551342240 is a wasteful number, since it uses less digits than its factorization.

1215551342240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480142 (or 480134 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 35.

Adding to 1215551342240 its reverse (422431555121), we get a palindrome (1637982897361).

The spelling of 1215551342240 in words is "one trillion, two hundred fifteen billion, five hundred fifty-one million, three hundred forty-two thousand, two hundred forty".