1215545503423 has 16 divisors (see below), whose sum is σ = 1288235612160. Its totient is φ = 1144911712000.

The previous prime is 1215545503421. The next prime is 1215545503433. The reversal of 1215545503423 is 3243055455121.

It is a cyclic number.

It is not a de Polignac number, because 1215545503423 - 2¹ = 1215545503421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215545503421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17749698 + ... + 17818048.

It is an arithmetic number, because the mean of its divisors is an integer number (80514725760).

Almost surely, 2^{1215545503423} is an apocalyptic number.

1215545503423 is a deficient number, since it is larger than the sum of its proper divisors (72690108737).

1215545503423 is a wasteful number, since it uses less digits than its factorization.

1215545503423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83378.

The product of its (nonzero) digits is 360000, while the sum is 40.

The spelling of 1215545503423 in words is "one trillion, two hundred fifteen billion, five hundred forty-five million, five hundred three thousand, four hundred twenty-three".