55516661555 has 16 divisors (see below), whose sum is σ = 68075126784. Its totient is φ = 43444287840.

The previous prime is 55516661521. The next prime is 55516661623.

55516661555 is nontrivially palindromic in base 10.

55516661555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55516661555 - 2⁶ = 55516661491 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 365774 + ... + 494796.

It is an arithmetic number, because the mean of its divisors is an integer number (4254695424).

Almost surely, 2^55516661555 is an apocalyptic number.

55516661555 is a deficient number, since it is larger than the sum of its proper divisors (12558465229).

55516661555 is a wasteful number, since it uses less digits than its factorization.

55516661555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130906.

The product of its digits is 3375000, while the sum is 50.

The spelling of 55516661555 in words is "fifty-five billion, five hundred sixteen million, six hundred sixty-one thousand, five hundred fifty-five".