251255243120 has 40 divisors (see below), whose sum is σ = 667621076064. Its totient is φ = 86144654592.

The previous prime is 251255243093. The next prime is 251255243123. The reversal of 251255243120 is 21342552152.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251255243123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224334479 + ... + 224335598.

Almost surely, 2^251255243120 is an apocalyptic number.

251255243120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251255243120 is an abundant number, since it is smaller than the sum of its proper divisors (416365832944).

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

251255243120 is a wasteful number, since it uses less digits than its factorization.

251255243120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448670097 (or 448670091 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 251255243120 its reverse (21342552152), we get a palindrome (272597795272).

The spelling of 251255243120 in words is "two hundred fifty-one billion, two hundred fifty-five million, two hundred forty-three thousand, one hundred twenty".