1553543412321 has 8 divisors (see below), whose sum is σ = 2071480720384. Its totient is φ = 1035650856240.

The previous prime is 1553543412271. The next prime is 1553543412329. The reversal of 1553543412321 is 1232143453551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1553543412321 - 2¹⁰ = 1553543411297 is a prime.

It is a super-2 number, since 2×1553543412321² (a number of 25 digits) contains 22 as substring.

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 1553543412321.

It is not an unprimeable number, because it can be changed into a prime (1553543412329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11106910 + ... + 11245911.

It is an arithmetic number, because the mean of its divisors is an integer number (258935090048).

Almost surely, 2^{1553543412321} is an apocalyptic number.

It is an amenable number.

1553543412321 is a deficient number, since it is larger than the sum of its proper divisors (517937308063).

1553543412321 is a wasteful number, since it uses less digits than its factorization.

1553543412321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22375991.

The product of its digits is 216000, while the sum is 39.

Adding to 1553543412321 its reverse (1232143453551), we get a palindrome (2785686865872).

The spelling of 1553543412321 in words is "one trillion, five hundred fifty-three billion, five hundred forty-three million, four hundred twelve thousand, three hundred twenty-one".