655555611 has 4 divisors (see below), whose sum is σ = 874074152. Its totient is φ = 437037072.

The previous prime is 655555609. The next prime is 655555639. The reversal of 655555611 is 116555556.

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

It is not a de Polignac number, because 655555611 - 2¹ = 655555609 is a prime.

It is a super-2 number, since 2×655555611² = 859506318227166642, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 655555611.

It is not an unprimeable number, because it can be changed into a prime (655555211) 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, 109259266 + ... + 109259271.

It is an arithmetic number, because the mean of its divisors is an integer number (218518538).

Almost surely, 2^655555611 is an apocalyptic number.

655555611 is a deficient number, since it is larger than the sum of its proper divisors (218518541).

655555611 is a wasteful number, since it uses less digits than its factorization.

655555611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218518540.

The product of its digits is 112500, while the sum is 39.

The square root of 655555611 is about 25603.8202422998. The cubic root of 655555611 is about 868.7000496029.

The spelling of 655555611 in words is "six hundred fifty-five million, five hundred fifty-five thousand, six hundred eleven".