66055111 has 4 divisors (see below), whose sum is σ = 66709224. Its totient is φ = 65401000.

The previous prime is 66055097. The next prime is 66055123. The reversal of 66055111 is 11155066.

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

It is a cyclic number.

It is not a de Polignac number, because 66055111 - 2⁷ = 66054983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66055151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326905 + ... + 327106.

It is an arithmetic number, because the mean of its divisors is an integer number (16677306).

Almost surely, 2^66055111 is an apocalyptic number.

66055111 is a deficient number, since it is larger than the sum of its proper divisors (654113).

66055111 is a wasteful number, since it uses less digits than its factorization.

66055111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654112.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 66055111 is about 8127.4295444501. The cubic root of 66055111 is about 404.2364539899.

It can be divided in two parts, 66055 and 111, that added together give a palindrome (66166).

The spelling of 66055111 in words is "sixty-six million, fifty-five thousand, one hundred eleven".