251111125240 has 16 divisors (see below), whose sum is σ = 565000031880. Its totient is φ = 100444450080.

The previous prime is 251111125141. The next prime is 251111125267. The reversal of 251111125240 is 42521111152.

251111125240 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3138889026 + ... + 3138889105.

Almost surely, 2^251111125240 is an apocalyptic number.

251111125240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251111125240 is an abundant number, since it is smaller than the sum of its proper divisors (313888906640).

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

251111125240 is a wasteful number, since it uses less digits than its factorization.

251111125240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6277778142 (or 6277778138 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 25.

Adding to 251111125240 its reverse (42521111152), we get a palindrome (293632236392).

The spelling of 251111125240 in words is "two hundred fifty-one billion, one hundred eleven million, one hundred twenty-five thousand, two hundred forty".