1215511550452 has 12 divisors (see below), whose sum is σ = 2127173210820. Its totient is φ = 607747775936.

The previous prime is 1215511550447. The next prime is 1215511550453. The reversal of 1215511550452 is 2540551155121.

It can be written as a sum of positive squares in 2 ways, for example, as 872647432336 + 342864118116 = 934156^2 + 585546^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215511550453) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1651177 + ... + 2270992.

It is an arithmetic number, because the mean of its divisors is an integer number (177264434235).

Almost surely, 2^{1215511550452} is an apocalyptic number.

It is an amenable number.

1215511550452 is a deficient number, since it is larger than the sum of its proper divisors (911661660368).

1215511550452 is a wasteful number, since it uses less digits than its factorization.

1215511550452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3999650 (or 3999648 counting only the distinct ones).

The product of its (nonzero) digits is 50000, while the sum is 37.

The spelling of 1215511550452 in words is "one trillion, two hundred fifteen billion, five hundred eleven million, five hundred fifty thousand, four hundred fifty-two".