211666055 has 8 divisors (see below), whose sum is σ = 257479152. Its totient is φ = 167012928.

The previous prime is 211666027. The next prime is 211666069. The reversal of 211666055 is 550666112.

211666055 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 211666055 - 2⁶ = 211665991 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 289589 + ... + 290318.

It is an arithmetic number, because the mean of its divisors is an integer number (32184894).

Almost surely, 2^211666055 is an apocalyptic number.

211666055 is a deficient number, since it is larger than the sum of its proper divisors (45813097).

211666055 is an equidigital number, since it uses as much as digits as its factorization.

211666055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579985.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 211666055 is about 14548.7475405961. The cubic root of 211666055 is about 595.9599456213.

The spelling of 211666055 in words is "two hundred eleven million, six hundred sixty-six thousand, fifty-five".