655603240400 has 30 divisors (see below), whose sum is σ = 1575086786022. Its totient is φ = 262241296000.

The previous prime is 655603240393. The next prime is 655603240423. The reversal of 655603240400 is 4042306556.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 199805424016 + 455797816384 = 446996^2 + 675128^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 819503651 + ... + 819504450.

Almost surely, 2^655603240400 is an apocalyptic number.

It is an amenable number.

655603240400 is an abundant number, since it is smaller than the sum of its proper divisors (919483545622).

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

655603240400 is a wasteful number, since it uses less digits than its factorization.

655603240400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639008119 (or 1639008108 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 35.

Adding to 655603240400 its reverse (4042306556), we get a palindrome (659645546956).

The spelling of 655603240400 in words is "six hundred fifty-five billion, six hundred three million, two hundred forty thousand, four hundred".