655505556 has 12 divisors (see below), whose sum is σ = 1529512992. Its totient is φ = 218501848.

The previous prime is 655505551. The next prime is 655505603.

655505556 is nontrivially palindromic in base 10.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×655505556³ (a number of 27 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655505551) 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, 27312720 + ... + 27312743.

It is an arithmetic number, because the mean of its divisors is an integer number (127459416).

Almost surely, 2^655505556 is an apocalyptic number.

It is an amenable number.

655505556 is an abundant number, since it is smaller than the sum of its proper divisors (874007436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

655505556 is a wasteful number, since it uses less digits than its factorization.

655505556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54625470 (or 54625468 counting only the distinct ones).

The product of its (nonzero) digits is 562500, while the sum is 42.

The square root of 655505556 is about 25602.8427327904. The cubic root of 655505556 is about 868.6779391534.

The spelling of 655505556 in words is "six hundred fifty-five million, five hundred five thousand, five hundred fifty-six".