15555550005505 has 48 divisors (see below), whose sum is σ = 20025730992384. Its totient is φ = 11596428241920.

The previous prime is 15555550005487. The next prime is 15555550005517. The reversal of 15555550005505 is 50550005555551.

It is a happy number.

It is not a de Polignac number, because 15555550005505 - 2¹⁷ = 15555549874433 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1432233775 + ... + 1432244635.

It is an arithmetic number, because the mean of its divisors is an integer number (417202729008).

Almost surely, 2^{15555550005505} is an apocalyptic number.

It is an amenable number.

15555550005505 is a deficient number, since it is larger than the sum of its proper divisors (4470180986879).

15555550005505 is a wasteful number, since it uses less digits than its factorization.

15555550005505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20626 (or 20609 counting only the distinct ones).

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

The spelling of 15555550005505 in words is "fifteen trillion, five hundred fifty-five billion, five hundred fifty million, five thousand, five hundred five".