1537643448109 has 4 divisors (see below), whose sum is σ = 1537656583104. Its totient is φ = 1537630313116.

The previous prime is 1537643448091. The next prime is 1537643448139. The reversal of 1537643448109 is 9018443467351.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1537643448109 - 2¹¹ = 1537643446061 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1537643448109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1537643448139) 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, 6390307 + ... + 6626560.

It is an arithmetic number, because the mean of its divisors is an integer number (384414145776).

Almost surely, 2^{1537643448109} is an apocalyptic number.

It is an amenable number.

1537643448109 is a deficient number, since it is larger than the sum of its proper divisors (13134995).

1537643448109 is a wasteful number, since it uses less digits than its factorization.

1537643448109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13134994.

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 1537643448109 in words is "one trillion, five hundred thirty-seven billion, six hundred forty-three million, four hundred forty-eight thousand, one hundred nine".