1215154451115 has 192 divisors, whose sum is σ = 2450615731200. Its totient is φ = 550489006080.

The previous prime is 1215154451087. The next prime is 1215154451117. The reversal of 1215154451115 is 5111544515121.

1215154451115 is a `hidden beast` number, since 1 + 2 + 1 + 51 + 544 + 51 + 1 + 15 = 666.

It is not a de Polignac number, because 1215154451115 - 2⁸ = 1215154450859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1215154451115.

It is not an unprimeable number, because it can be changed into a prime (1215154451117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 868587186 + ... + 868588584.

It is an arithmetic number, because the mean of its divisors is an integer number (12763623600).

Almost surely, 2^{1215154451115} is an apocalyptic number.

1215154451115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1215154451115 is an abundant number, since it is smaller than the sum of its proper divisors (1235461280085).

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

1215154451115 is a wasteful number, since it uses less digits than its factorization.

1215154451115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2114 (or 2111 counting only the distinct ones).

The product of its digits is 20000, while the sum is 36.

Adding to 1215154451115 its reverse (5111544515121), we get a palindrome (6326698966236).

The spelling of 1215154451115 in words is "one trillion, two hundred fifteen billion, one hundred fifty-four million, four hundred fifty-one thousand, one hundred fifteen".