55555721885 has 4 divisors (see below), whose sum is σ = 66666866268. Its totient is φ = 44444577504.

The previous prime is 55555721861. The next prime is 55555721911. The reversal of 55555721885 is 58812755555.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39364940836 + 16190781049 = 198406^2 + 127243^2 .

It is a cyclic number.

It is not a de Polignac number, because 55555721885 - 2¹⁰ = 55555720861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55555721885.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5555572184 + ... + 5555572193.

It is an arithmetic number, because the mean of its divisors is an integer number (16666716567).

Almost surely, 2^55555721885 is an apocalyptic number.

It is an amenable number.

55555721885 is a deficient number, since it is larger than the sum of its proper divisors (11111144383).

55555721885 is a wasteful number, since it uses less digits than its factorization.

55555721885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11111144382.

The product of its digits is 14000000, while the sum is 56.

The spelling of 55555721885 in words is "fifty-five billion, five hundred fifty-five million, seven hundred twenty-one thousand, eight hundred eighty-five".