1213552413440 has 72 divisors (see below), whose sum is σ = 2908456803168. Its totient is φ = 485150515200.

The previous prime is 1213552413433. The next prime is 1213552413461. The reversal of 1213552413440 is 443142553121.

It is a self number, because there is not a number n which added to its sum of digits gives 1213552413440.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2042069 + ... + 2568491.

Almost surely, 2^{1213552413440} is an apocalyptic number.

1213552413440 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 1213552413440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1454228401584).

1213552413440 is an abundant number, since it is smaller than the sum of its proper divisors (1694904389728).

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

1213552413440 is an equidigital number, since it uses as much as digits as its factorization.

1213552413440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528245 (or 528231 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 1213552413440 its reverse (443142553121), we get a palindrome (1656694966561).

The spelling of 1213552413440 in words is "one trillion, two hundred thirteen billion, five hundred fifty-two million, four hundred thirteen thousand, four hundred forty".