15505420320055 has 8 divisors (see below), whose sum is σ = 18606731914512. Its totient is φ = 12404184569088.

The previous prime is 15505420320043. The next prime is 15505420320113. The reversal of 15505420320055 is 55002302450551.

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

It is a cyclic number.

It is not a de Polignac number, because 15505420320055 - 2¹¹ = 15505420318007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15505420319996 and 15505420320023.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 18510129 + ... + 19329658.

It is an arithmetic number, because the mean of its divisors is an integer number (2325841489314).

Almost surely, 2^{15505420320055} is an apocalyptic number.

15505420320055 is a deficient number, since it is larger than the sum of its proper divisors (3101311594457).

15505420320055 is an equidigital number, since it uses as much as digits as its factorization.

15505420320055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37921745.

The product of its (nonzero) digits is 150000, while the sum is 37.

The spelling of 15505420320055 in words is "fifteen trillion, five hundred five billion, four hundred twenty million, three hundred twenty thousand, fifty-five".