355555551111111 has 24 divisors (see below), whose sum is σ = 553087138765616. Its totient is φ = 218803128888960.

The previous prime is 355555551111073. The next prime is 355555551111191. The reversal of 355555551111111 is 111111155555553.

355555551111111 is a `hidden beast` number, since 3 + 5 + 5 + 5 + 5 + 5 + 5 + 511 + 11 + 111 = 666.

355555551111111 is a nontrivial binomial coefficient, being equal to C(26666667, 2).

It is not a de Polignac number, because 355555551111111 - 2²⁶ = 355555484002247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (355555551111191) 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 23 ways as a sum of consecutive naturals, for example, 118518516 + ... + 121481478.

Almost surely, 2^{355555551111111} is an apocalyptic number.

355555551111111 is the 26666666-th triangular number.

355555551111111 is a deficient number, since it is larger than the sum of its proper divisors (197531587654505).

355555551111111 is a wasteful number, since it uses less digits than its factorization.

355555551111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3988623 (or 3988620 counting only the distinct ones).

The product of its digits is 234375, while the sum is 45.

The spelling of 355555551111111 in words is "three hundred fifty-five trillion, five hundred fifty-five billion, five hundred fifty-one million, one hundred eleven thousand, one hundred eleven".