251340055340 has 72 divisors (see below), whose sum is σ = 600164979120. Its totient is φ = 88244759680.

The previous prime is 251340055243. The next prime is 251340055349. The reversal of 251340055340 is 43550043152.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 251340055297 and 251340055306.

It is not an unprimeable number, because it can be changed into a prime (251340055349) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1720502 + ... + 1860861.

It is an arithmetic number, because the mean of its divisors is an integer number (8335624710).

Almost surely, 2^251340055340 is an apocalyptic number.

251340055340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251340055340 is an abundant number, since it is smaller than the sum of its proper divisors (348824923780).

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

251340055340 is a wasteful number, since it uses less digits than its factorization.

251340055340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3581423 (or 3581410 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 32.

Adding to 251340055340 its reverse (43550043152), we get a palindrome (294890098492).

The spelling of 251340055340 in words is "two hundred fifty-one billion, three hundred forty million, fifty-five thousand, three hundred forty".