255566002000 has 80 divisors (see below), whose sum is σ = 618274726992. Its totient is φ = 102174105600.

The previous prime is 255566001989. The next prime is 255566002007. The reversal of 255566002000 is 200665552.

It can be written as a sum of positive squares in 8 ways, for example, as 9458729536 + 246107272464 = 97256^2 + 496092^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255566002007) 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, 4002324 + ... + 4065676.

Almost surely, 2^255566002000 is an apocalyptic number.

255566002000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255566002000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (309137363496).

255566002000 is an abundant number, since it is smaller than the sum of its proper divisors (362708724992).

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

255566002000 is a wasteful number, since it uses less digits than its factorization.

255566002000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65393 (or 65377 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 255566002000 its reverse (200665552), we get a palindrome (255766667552).

The spelling of 255566002000 in words is "two hundred fifty-five billion, five hundred sixty-six million, two thousand".