1536221165441 has 4 divisors (see below), whose sum is σ = 1544264208384. Its totient is φ = 1528178122500.

The previous prime is 1536221165429. The next prime is 1536221165443. The reversal of 1536221165441 is 1445611226351.

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 a de Polignac number, because none of the positive numbers 2^k-1536221165441 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1536221165443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4021521185 + ... + 4021521566.

It is an arithmetic number, because the mean of its divisors is an integer number (386066052096).

Almost surely, 2^{1536221165441} is an apocalyptic number.

It is an amenable number.

1536221165441 is a deficient number, since it is larger than the sum of its proper divisors (8043042943).

1536221165441 is an equidigital number, since it uses as much as digits as its factorization.

1536221165441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8043042942.

The product of its digits is 172800, while the sum is 41.

The spelling of 1536221165441 in words is "one trillion, five hundred thirty-six billion, two hundred twenty-one million, one hundred sixty-five thousand, four hundred forty-one".