1553550021439 has 32 divisors (see below), whose sum is σ = 1720408536000. Its totient is φ = 1394167956480.

The previous prime is 1553550021433. The next prime is 1553550021473. The reversal of 1553550021439 is 9341200553551.

It is not a de Polignac number, because 1553550021439 - 2³¹ = 1551402537791 is a prime.

It is a super-2 number, since 2×1553550021439² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1553550021395 and 1553550021404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1553550021433) 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 31 ways as a sum of consecutive naturals, for example, 18481597 + ... + 18565465.

It is an arithmetic number, because the mean of its divisors is an integer number (53762766750).

Almost surely, 2^{1553550021439} is an apocalyptic number.

1553550021439 is a deficient number, since it is larger than the sum of its proper divisors (166858514561).

1553550021439 is a wasteful number, since it uses less digits than its factorization.

1553550021439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84235.

The product of its (nonzero) digits is 405000, while the sum is 43.

The spelling of 1553550021439 in words is "one trillion, five hundred fifty-three billion, five hundred fifty million, twenty-one thousand, four hundred thirty-nine".