1550555020505 has 4 divisors (see below), whose sum is σ = 1860666024612. Its totient is φ = 1240444016400.

The previous prime is 1550555020493. The next prime is 1550555020513. The reversal of 1550555020505 is 5050205550551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 209621128336 + 1340933892169 = 457844^2 + 1157987^2 .

It is not a de Polignac number, because 1550555020505 - 2²⁰ = 1550553971929 is a prime.

It is a super-2 number, since 2×1550555020505² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155055502046 + ... + 155055502055.

It is an arithmetic number, because the mean of its divisors is an integer number (465166506153).

Almost surely, 2^{1550555020505} is an apocalyptic number.

It is an amenable number.

1550555020505 is a deficient number, since it is larger than the sum of its proper divisors (310111004107).

1550555020505 is an equidigital number, since it uses as much as digits as its factorization.

1550555020505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310111004106.

The product of its (nonzero) digits is 156250, while the sum is 38.

The spelling of 1550555020505 in words is "one trillion, five hundred fifty billion, five hundred fifty-five million, twenty thousand, five hundred five".