1543551205513 has 4 divisors (see below), whose sum is σ = 1585268805700. Its totient is φ = 1501833605328.

The previous prime is 1543551205499. The next prime is 1543551205519. The reversal of 1543551205513 is 3155021553451.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 916084437129 + 627466768384 = 957123^2 + 792128^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1543551205513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1543551205519) 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, 20858800038 + ... + 20858800111.

It is an arithmetic number, because the mean of its divisors is an integer number (396317201425).

Almost surely, 2^{1543551205513} is an apocalyptic number.

It is an amenable number.

1543551205513 is a deficient number, since it is larger than the sum of its proper divisors (41717600187).

1543551205513 is an equidigital number, since it uses as much as digits as its factorization.

1543551205513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41717600186.

The product of its (nonzero) digits is 225000, while the sum is 40.

Adding to 1543551205513 its reverse (3155021553451), we get a palindrome (4698572758964).

The spelling of 1543551205513 in words is "one trillion, five hundred forty-three billion, five hundred fifty-one million, two hundred five thousand, five hundred thirteen".