655511120 has 80 divisors (see below), whose sum is σ = 1716318720. Its totient is φ = 230668800.

The previous prime is 655511119. The next prime is 655511123. The reversal of 655511120 is 21115556.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 655511120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655511123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15266 + ... + 39294.

It is an arithmetic number, because the mean of its divisors is an integer number (21453984).

Almost surely, 2^655511120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655511120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (858159360).

655511120 is an abundant number, since it is smaller than the sum of its proper divisors (1060807600).

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

655511120 is a wasteful number, since it uses less digits than its factorization.

655511120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24084 (or 24078 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 26.

The square root of 655511120 is about 25602.9513923688. The cubic root of 655511120 is about 868.6803969563.

Adding to 655511120 its reverse (21115556), we get a palindrome (676626676).

The spelling of 655511120 in words is "six hundred fifty-five million, five hundred eleven thousand, one hundred twenty".