251333320280 has 128 divisors (see below), whose sum is σ = 667424983680. Its totient is φ = 83378626560.

The previous prime is 251333320267. The next prime is 251333320283. The reversal of 251333320280 is 82023333152.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251333320283) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1808144 + ... + 1942176.

It is an arithmetic number, because the mean of its divisors is an integer number (5214257685).

Almost surely, 2^251333320280 is an apocalyptic number.

251333320280 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 251333320280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (333712491840).

251333320280 is an abundant number, since it is smaller than the sum of its proper divisors (416091663400).

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

251333320280 is a wasteful number, since it uses less digits than its factorization.

251333320280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134269 (or 134265 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The spelling of 251333320280 in words is "two hundred fifty-one billion, three hundred thirty-three million, three hundred twenty thousand, two hundred eighty".