1215512122550 has 96 divisors (see below), whose sum is σ = 2506933545984. Its totient is φ = 434766528000.

The previous prime is 1215512122537. The next prime is 1215512122589. The reversal of 1215512122550 is 552212155121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16872707 + ... + 16944593.

It is an arithmetic number, because the mean of its divisors is an integer number (26113891104).

Almost surely, 2^{1215512122550} is an apocalyptic number.

1215512122550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1215512122550 is an abundant number, since it is smaller than the sum of its proper divisors (1291421423434).

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

1215512122550 is a wasteful number, since it uses less digits than its factorization.

1215512122550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72414 (or 72409 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 32.

Adding to 1215512122550 its reverse (552212155121), we get a palindrome (1767724277671).

The spelling of 1215512122550 in words is "one trillion, two hundred fifteen billion, five hundred twelve million, one hundred twenty-two thousand, five hundred fifty".