1215551323340 has 24 divisors (see below), whose sum is σ = 2702814119712. Its totient is φ = 457619321600.

The previous prime is 1215551323321. The next prime is 1215551323367. The reversal of 1215551323340 is 433231555121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1215551323340.

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, 1787575136 + ... + 1787575815.

It is an arithmetic number, because the mean of its divisors is an integer number (112617254988).

Almost surely, 2^{1215551323340} is an apocalyptic number.

1215551323340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215551323340 is an abundant number, since it is smaller than the sum of its proper divisors (1487262796372).

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

1215551323340 is a wasteful number, since it uses less digits than its factorization.

1215551323340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3575150977 (or 3575150975 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 35.

Adding to 1215551323340 its reverse (433231555121), we get a palindrome (1648782878461).

The spelling of 1215551323340 in words is "one trillion, two hundred fifteen billion, five hundred fifty-one million, three hundred twenty-three thousand, three hundred forty".