1215545450544 has 80 divisors (see below), whose sum is σ = 3504302024800. Its totient is φ = 403412431104.

The previous prime is 1215545450461. The next prime is 1215545450551. The reversal of 1215545450544 is 4450545455121.

1215545450544 is a `hidden beast` number, since 1 + 2 + 1 + 5 + 5 + 4 + 54 + 50 + 544 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1215545450544.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6044659 + ... + 6242514.

It is an arithmetic number, because the mean of its divisors is an integer number (43803775310).

Almost surely, 2^{1215545450544} is an apocalyptic number.

It is an amenable number.

1215545450544 is an abundant number, since it is smaller than the sum of its proper divisors (2288756574256).

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

1215545450544 is a wasteful number, since it uses less digits than its factorization.

1215545450544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12287419 (or 12287407 counting only the distinct ones).

The product of its (nonzero) digits is 1600000, while the sum is 45.

The spelling of 1215545450544 in words is "one trillion, two hundred fifteen billion, five hundred forty-five million, four hundred fifty thousand, five hundred forty-four".