251040223324240 has 120 divisors (see below), whose sum is σ = 680415222326112. Its totient is φ = 85886627016960.

The previous prime is 251040223324201. The next prime is 251040223324277. The reversal of 251040223324240 is 42423322040152.

It is a junction number, because it is equal to n+sod(n) for n = 251040223324196 and 251040223324205.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 66735606 + ... + 70396885.

Almost surely, 2^{251040223324240} is an apocalyptic number.

251040223324240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251040223324240 is an abundant number, since it is smaller than the sum of its proper divisors (429374999001872).

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

251040223324240 is a wasteful number, since it uses less digits than its factorization.

251040223324240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137132985 (or 137132972 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 34.

Adding to 251040223324240 its reverse (42423322040152), we get a palindrome (293463545364392).

The spelling of 251040223324240 in words is "two hundred fifty-one trillion, forty billion, two hundred twenty-three million, three hundred twenty-four thousand, two hundred forty".