1550555505505 has 4 divisors (see below), whose sum is σ = 1860666606612. Its totient is φ = 1240444404400.

The previous prime is 1550555505497. The next prime is 1550555505509. The reversal of 1550555505505 is 5055055550551.

It is a happy number.

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 1236951025489 + 313604480016 = 1112183^2 + 560004^2 .

It is not a de Polignac number, because 1550555505505 - 2³ = 1550555505497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1550555505509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155055550546 + ... + 155055550555.

It is an arithmetic number, because the mean of its divisors is an integer number (465166651653).

Almost surely, 2^{1550555505505} is an apocalyptic number.

It is an amenable number.

1550555505505 is a deficient number, since it is larger than the sum of its proper divisors (310111101107).

1550555505505 is an equidigital number, since it uses as much as digits as its factorization.

1550555505505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310111101106.

The product of its (nonzero) digits is 1953125, while the sum is 46.

The spelling of 1550555505505 in words is "one trillion, five hundred fifty billion, five hundred fifty-five million, five hundred five thousand, five hundred five".