55581818555 has 8 divisors (see below), whose sum is σ = 66699456000. Its totient is φ = 44464605696.

The previous prime is 55581818491. The next prime is 55581818623.

55581818555 is nontrivially palindromic in base 10.

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 55581818555 - 2⁶ = 55581818491 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55581818555.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 410246 + ... + 528644.

It is an arithmetic number, because the mean of its divisors is an integer number (8337432000).

Almost surely, 2^55581818555 is an apocalyptic number.

55581818555 is a deficient number, since it is larger than the sum of its proper divisors (11117637445).

55581818555 is a wasteful number, since it uses less digits than its factorization.

55581818555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212293.

The product of its digits is 8000000, while the sum is 56.

The spelling of 55581818555 in words is "fifty-five billion, five hundred eighty-one million, eight hundred eighteen thousand, five hundred fifty-five".