1553551325321 has 16 divisors (see below), whose sum is σ = 1598123799936. Its totient is φ = 1509565214976.

The previous prime is 1553551325297. The next prime is 1553551325363. The reversal of 1553551325321 is 1235231553551.

It is a cyclic number.

It is not a de Polignac number, because 1553551325321 - 2³⁰ = 1552477583497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1553541325321) 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, 7582796 + ... + 7784978.

It is an arithmetic number, because the mean of its divisors is an integer number (99882737496).

Almost surely, 2^{1553551325321} is an apocalyptic number.

It is an amenable number.

1553551325321 is a deficient number, since it is larger than the sum of its proper divisors (44572474615).

1553551325321 is a wasteful number, since it uses less digits than its factorization.

1553551325321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203632.

The product of its digits is 337500, while the sum is 41.

Adding to 1553551325321 its reverse (1235231553551), we get a palindrome (2788782878872).

The spelling of 1553551325321 in words is "one trillion, five hundred fifty-three billion, five hundred fifty-one million, three hundred twenty-five thousand, three hundred twenty-one".