55511611555 has 32 divisors (see below), whose sum is σ = 72193590144. Its totient is φ = 40823709696.

The previous prime is 55511611553. The next prime is 55511611577.

It is a happy number.

55511611555 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 55511611555 - 2¹ = 55511611553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55511611553) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 595687 + ... + 682543.

It is an arithmetic number, because the mean of its divisors is an integer number (2256049692).

Almost surely, 2^55511611555 is an apocalyptic number.

55511611555 is a deficient number, since it is larger than the sum of its proper divisors (16681978589).

55511611555 is a wasteful number, since it uses less digits than its factorization.

55511611555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87055.

The product of its digits is 93750, while the sum is 40.

The spelling of 55511611555 in words is "fifty-five billion, five hundred eleven million, six hundred eleven thousand, five hundred fifty-five".