655611081 has 4 divisors (see below), whose sum is σ = 874148112. Its totient is φ = 437074052.

The previous prime is 655611071. The next prime is 655611083. The reversal of 655611081 is 180116556.

655611081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 655611081 - 2¹¹ = 655609033 is a prime.

It is a super-3 number, since 3×655611081³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (655611083) 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, 109268511 + ... + 109268516.

It is an arithmetic number, because the mean of its divisors is an integer number (218537028).

Almost surely, 2^655611081 is an apocalyptic number.

It is an amenable number.

655611081 is a deficient number, since it is larger than the sum of its proper divisors (218537031).

655611081 is a wasteful number, since it uses less digits than its factorization.

655611081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218537030.

The product of its (nonzero) digits is 7200, while the sum is 33.

The square root of 655611081 is about 25604.9034561742. The cubic root of 655611081 is about 868.7245506683.

The spelling of 655611081 in words is "six hundred fifty-five million, six hundred eleven thousand, eighty-one".